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Guns Sale in Parkersburg, WV
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Delay Kaldor-Kalecki Model Revisited. September 2014
- Curtis Davidson
- 1 years ago
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1 Discussion Paper No.234 Delay Kaldor-Kalecki Model Revisited Akio Matsumoto Chuo University Ferenc Szidarovszky University of Pécs September 2014 INSTITUTE OF ECONOMIC RESEARCH Chuo University Tokyo, Japan
2 Delay Kaldor-Kalecki Model Revisited Akio Matsumoto y Chuo University Ferenc Szidarovszky z University of Pécs Abstract This paper studies dynamics of the Kaldor-Kalecki model of national income and capital stock. The investment function is assumed to have not only a Kaldorian characteristics, namely, a S-shaped form but also a Kaleckian characteristics, that is, a gestation delay between "investment decision" and "investment implementation." We divide the analysis into two parts. In the rst part, we assume that the time period under consideration is short enough so that the capital stock is not a ected by the ow of investment and then examine the delay e ect on dynamics of national income. In the second part, taking the capital accumulation into account, we draw attention to how the delay a ects cyclic dynamics observed in the non-delay Kaldor-Kalecki model. It is demonstrated that the investment delay quantitatively a ects the dynamic behavior but not qualitatively. The authors highly appreciate the nancial supports from the MEXT-Supported Program for the Strategic Research Foundation at Private Universities and the Japan Society for the Promotion of Science (Grant-in-Aid for Scienti c Research (C) , and ). The usual disclaimers apply. y Professor, Department of Economics, Senior Researcher, Institute of Further Develpment of Dynamic Economic Research, Chuo University, 742-1, Higashi-Nakano, Hachioji, Tokyo, , Japan; z Professor, Department of Applied Mathematics, University of Pécs, Ifjúság, u 6, H-7624, Pécs, Hungary; 1
3 1 Introduction In real economy, macroeconomic variables such as national income, capital accumulation, interest rate, etc. exhibit cyclic uctuations. As a natural consequence, it has been the main interest in studying macro economic dynamics to detect endogenous sources of such cyclic behavior. Since investment is considered to be the key factor to cyclic dynamics for evolution of national economy, a lot of e orts have been devoted to studying investment determinations. As early as in 1930s, a few years before the publication of the Keynes General Theory, Kalecki (1935) introduces an idea of the consumption function and the multiplier in his statistic analysis of macro economy. Furthermore, regarding investment in the dynamic analysis, he assumes a lag between "investment order" and "investment installation" and call it a gestation lag of investment. 1 Adopting a linear investment function, he constructs a macro dynamic model as a delay di erential equation of retarded type. It had been already shown that Kalecki s model gives rise to a cycle due to the delay. Kaldor (1940), on the other hand, studies the evolution of production and capital formation and believes that nonlinearities of behavioral equations could be a clincher in such cyclic oscillations. He builts a 2D model of national income and captial with nonlinear investment and saving functions. Its basic movements consist of two sorts. One is the movements along the nonlinear functions and the other is shifts of these functions according to capital accumulations. So far, it has also been con rmed in various ways that the Kaldor model is capable of generating cyclic behavior when nonlinearities become strong enough. Indeed, Ichimura (1955) reduces the model to the Liénard equation, Chang and Smyth (1971) rigorously show the existence of a limit cycle by applying the Poincaré-Bendixson theorem and so does Lorenz (1993) by the Hopf bifurcation theorem. Furthermore, Grasman and Wentzel (1994) show multi-stability in the Kaldor model, that is, the coexistence of stable and unstable cycles when the equilibrium is locally stable. "Nonlinearity" and "delay" are now treated as two of the main ingredients for endogenous cycles. More than a half century after Kaldor (1940), Krawiec and Szydlowski (1999) combine the Kaldor model with the Kaleckian time delay in investment to built a delay business cycle model. Their model is often called (delay) Kaldor-Kalecki model. To emphasize the role of delay, they assume a linear investment function as in the Kalecki model and then show the occurrence of a limit cycle with respect to time delay. We will revisit the Kaldor-Kalecki model and concern the roles of nonlinearity and delay for the birth of limit cycles in order to complement Krawiec and Szydlowski (1999). For this purpose, we rst recapitulate the 2D Kaldor-Kalecki model and specify the investment function. Then we proceed to the analysis of delay dynamics with two steps. At the rst step, we investigate dynamics of national income, keeping the stock of capital xed. As is well known, no cyclic behavior arises in the Kaldor model without captial accumulation. We focus attention on the e ect caused by delay on such stable dynamics. Since invest- 1 Since "lag" and "delay" do not have distinctive di erent meanings, we use these words interchangeably. In particular, we mainly use "delay" in this study. 2
4 ment and savings are short term, eliminating captial or xing capital implies short-run dynamic analysis. At the second step we consider delay dynamics of national income and capital accumulation. As is seen above, the nonlinear Kaldor model without delay can generate not only one limit cycle but also multiple limit cycles while the linear delay Kaldor-Kalecki model also give rise to a limit cycle. A natural question we rise is how the delay a ects these cyclic behavior in the long-run. This paper is organized as follows. In Section 2, the basic elements of the Kaldor-Kalecki model is rebuilt. In Section 3, short-run dynamics is examined under the investment delay. In Section 4, after reviewing the Kaldor model without delay quickly, we analytically and numerically detect the delay e ect on cyclic dynamics of the Kaldor-Kalecki model from the long-run point of view in the sense that capital accumulation is explicitly taken into account. Section 5 contains some concluding remarks. 2 Delay Dynamic Model Kaldor (1940) relates investment to the level in income (i.e., pro t principle) and extends it by proposing a sigmoidal, instead of linear, investment function. A brief description of his model is given by two equations, _Y (t) = [(Y (t); K(t)) S(Y (t))] _K(t) = (Y (t); K(t)) K(t): (1) where Y (t) is national income at time t; K(t) denotes capital, (Y (t); K(t)) is an investment function, S(Y (t)) is a savings function and the parameters and denote the adjustment coe cient and the rate of depreciation. The rst equation describes the national income adjustment process and the second describes capital accumulation process. As will be reviewed soon, the Kaldor model is able to generate endogenous limit cycles. There are two ingredients for the birth of the cycles, the nonlinearity of investment in Y and the dependency of investment in K: These two prevent Y and K for global divergence when the equilibrium is locally unstable. Using our notation and following his spirit, a Kaleckian investment function can be presented by I(t) = (Y (t ); K(t)) where denotes the gestation delay. 2 Replacing the investment function in the second equation of system (2) with Kaleckian function yields the Kaldor-Kalecki 2 There are several extensions of this delay investment function. Kadder and Talibi Alaudi (2008) introduce time delay also in capital stock in capital accumulation equation (i.e., (Y (t ); K(t ))). Zhou and Li (2009) assume that the investment function in the capital accumulation depends on the income and the captial stock at di errent gestation periods (i.e., (Y (t 1 ); K(t 2 )) with 1 6= 2 ). 3
5 model of the income and captial stock, _Y (t) = [(Y (t); K(t)) S(Y (t))] ; _K(t) = (Y (t ); K(t)) K(t): (2) We plan to analyze dynamics generated by (2) with two steps. At rst step, we con ne attention to short-run dynamics. To this end, we impose two assumptions: Assumption 1. The time period under consideration is short enough so that the capital stock is not a ected by the ow of investment. Assumption 2. The investment function in the rst equation of system (2) contains the delay. As a consequence of these modi cations, the second equation concerning the evolution of capital is eliminated and the variable K in the investment function also disappears. Thus the modi ed Kaldor-Kalecki model can be presented by a one dimensional nonlinear di erential equation with one time delay, _Y (t) = f'[y (t )] S[Y (t)]g (3) After examining short-run dynamics, we proceed to the second step in which the dynamic analysis of Y (t) and K(t) generated by system (2) is investigated. It is considered to be long-run dynamics in the sense that the national income as well as the capital stocks evolve over time. We will numerically con rm the existing analytical results and then consider the e ects of the delay on them. 3 Short-run Dynamics We rst make the following two assumptions for the sake of analytical simplicity. Assumption 3. The saving function is linear and has no autonomous savings, S(Y ) = sy; 0 < s < 1: Assumption 4. The investment function has the S-shaped form, '(Y ) = A 2 1 (CY +D) 2 + BY K: Parameter K in '(Y ) is positive implying the xed level of the capital stock. 3 At a stationary state of equation (3), two conditions, Y _ (t) = 0 and Y (t) = Y (t ) = Y e for all t 0; are satis ed. Economically, these conditions can be restated as investment is equal to saving at the equilibrium. In Figure 1, we 3 This is a simpli ed version of the investment function adopted in Lorenz (1987). It is replaced with the full version in the latter half of this paper. 4
6 superimpose the linear saving function, sy with s = 0:282, on the three sigmoid investment functions with A = 35, B = 0:02; C = 0:01; D = 0:00001 and three di erent values of K (i.e., K = 5; 10; 15). The equilibrium state is determined by the intersection of these curves. Figure 1. Determination of equilibrium with di erent values of K When the xed value of K is small, we will have a high level of investment and thus a high short-run equilibrium level YH e of national income. As K increases, the investment curve shifts downward. Due to the S-shaped form, there is a case where the saving curve crosses the investment curve three times. These intersections are denoted by the black dotes and their x-coordinates are the corresponding equilibrium levels of national income, Y1 e < Y2 e < Y3 e. A further increase of K shifts the investment curve downward enough resulting in only one intersection denoted by the lower green dotted point and the corresponding national income is YL e. Investment is small here and thus the equilibrium level is also small. We draw attention to stability of the three equilibrium points obtained under the middle value of K. Let Y i = Y Yi e for i = 1; 2; 3: The linear approximation of equation (3) is _Y i (t) = i Y i (t ) sy i (t) (4) where i = ' 0 (Yi e ) > 0 denotes the slope of the investment curve at the equilibrium income Yi e. Substituting an exponential solution, e t u; yields the characteristic equation, + s i e = 0: (5) In the absence of time delay (i.e., = 0), we simply have, i = ( i s): (6) 5
7 If i < s or i < 0; then the equilibrium income Yi e is stable. Since investment is greater or less than savings in the left or right of the intersection, any nonequilibrium Y approaches its equilibrium level by the multiplier. Similarly it is locally unstable if i > s or i > 0: The sign of i s depends on the slopes of the investment and saving curves evaluated at the equilibrium point. Apparently, among three equilibrium values, 1 s < 0 at e 1 ; 2 s > 0 at e 2 and 3 s < 0 at e 3. The middle one (i.e., Y2 e ) is locally unstable and the remaining high and low ones (i.e., Y1 e and Y3 e ) are locally stable. It is also clear that the unique equilibrium YL e or Y H e is locally stable. As a benchmark, we summarize these results as follows. Theorem 1 When equation (4) with = 0 has three equilibria, then the middle one is locally unstable while both of the larger and smaller ones are locally asymptotically stable. Kaldor (1940) focuses on the unstable equilibrium. The main key to it is the captial accumulation that shifts the short-term investment function over time which gives rise to a cycle. On the other hand, we focus on the stable equilibrium and consider whether the delay a ects its stability. Hence we return to equation (5) with > 0: It should be noticed that = 0 does not solve this equation unless s = i. So if stability of Yi e switches at = ; then equation (5) must have a pair of pure imaginary roots there. Since roots of a real function always come in conjugate pairs, we assume = i! with! > 0. Substitution of this root divides equation (5) into the real and imaginary parts, s i cos! = 0;! + i sin! = 0: (7) Moving the rst term in each equation to the right, squaring the resultant equations and adding them together yield! 2 = 2 ( i + s)( i s) (8) where the rst two factors on the right hand side are positive. If i s > 0; then there is a positive! and stability switch can occur. The condition, i > s; could be possible only at the middle equilibrium point Y2 e : However since it is already shown to be locally unstable for = 0, Y2 e still remains unstable for any > 0: On the other hand, i < s holds at the other equilibrium points. If i s 0; then there is no! > 0 implying that stability switch does not occur. Summarizing these results yields the following: Theorem 2 For any equilibria of the delay equation (3), no stability switch occurs for any positive value of the delay. Theorem 2 implies that the delay does not a ect asymptotic dynamics of the delay model (3). In spite of this result, we show that it really matters in transient dynamics. In particular, following Beddington and May (1975), we show that 6
8 the delay increases the real parts of the eigenvalues for a stable equilibrium point and decreases the magnitude for an unstable equilibrium point. We proceed to illustrate these e ects of the investment delay in the three equilibria case. We assume that = x + iy with y 0 and substitute it into equation (5), After arranging the terms, we obtain x + iy = s + i e x cos y + i i e x sin y : Comparing both sides nds that the real and imaginary parts are x = y = s + i e x cos y; i e x sin y; (9) from which we derive the form of the real part depending on y and ; x = s y cot y: (10) Moving the rst term in the right hand side of the rst equation in (9) to the left hand side, squaring both sides of the resultant equation and adding the square of the second equations to it yield the imaginary part depending on x and, q y = ( i ) 2 e 2x (x + s) 2 : (11) Solving equation (9) with y = 0 for x yields the real part functional for. The equation is x + s = i e x (12) which clearly has a unique real solution for x that is denoted by x(): For = 0; x i (0) = ( i s) which is identical with equation (6). By implicitly di erentiating this equation (12), we have that dx() dx() = d i e x() d x() implying that dx() d = x() i e x() 1 + i e : x() So if x() > 0; then dx()=d < 0 implying that x() decreases, and if x() < 0; then dx()=d > 0 implying that x() increases. In both cases jx()j decreases. Hence we have Theorem 3. Theorem 3 Larger delays result in the smaller absolute value of the real parts and thus slow down convergence speed to stable equilibrium. 7
9 4 Long-run Dynamics 4.1 Kaldor Model We review the original Kaldor model (1). So far, in this model, it is demonstrated that the nonlinearity of investment functions leads to the two remarkable results. One is the existence of a stable limit cycle shown by Chang and Smyth (1971) with applying the Poincáre-Bendixson theorem when the equilibrium is locally unstable equilibrium and the other is the coexistence of a stable limit cycle and a unstable limit cycle by Grasman and Wentzel (1994) with the use of a Hopf bifurcation theorem when the equilibrium is locally stable. Figure 2 graphically con rms these results with the following form of the separable investment function, 4 (Y; K) = (0:015Y +0:00001) :05Y + 5 : K and = 3. The positive sloping dashed curve is the K _ = 0 locus and the convex-concave dashed curve is the Y _ = 0 locus. The intersection of these curves determines the stationary equilibrium point denoted by (Y e ; K e ): In Figure 2(A) where we take s = 0:3; the stationary point (Y e ; K e ) ' (54:05; 324:32), is locally unstable as we will see shortly and two trajectories starting in a neighborhood of the stationary point explosively oscillate and approach the limit cycle. In Figure 2(B), s is decreased to 0:282 and any other parameters are kept to be xed. The equilibrium point (Y e ; K e ) ' (67:72; 381:94; 54:05) becomes stable, which is enclosed by an unstable inner limit cycle which is, in turn, enclosed by an outer stable limit cycle. A green trajectory starting inside of the inner limit cycle converges to the equilibrium point while both the red trajectory starting outside of the inner limit cycle and the blue trajectory starting outside of the outer limit cycle approaches the outer cycle. The black dots denote the initial 4 Lorenz (1987) uses this form of the function to show the occurrence of chaotic motion in a multisector Kaldorian business cycle model. Grasman and Wentzel (1994) also use this form. 8
10 points in simulations. (A) One limit cycle (B) Two limit cycles Figure 2. Limit cycles in the Kaldor model Kaldorian nonlinear dynamics is often examined with respect to the value of the adjustment coe cient. 5 Figure 2 indicates that Kaldorian dynamics has also strong sensitivity to the value of s: Two di erent dynamics illustrated in Figure 2 imply that there is a threshold value of s and the changing of the parameter through this value causes a qualitative change in the nature of dynamics. A bifurcation diagram gives good insights into what is happening to evolution of the equilibrium point as the value of the parameter is changed. In Figure 3(A), the value of s is increased from 0:25 to 0:38 with an increment 1= For each value of s, the dynamic system (1) runs for t 2 [0; 500] and the local maximum and minimum values of the speci ed trajectory for 400 t 500 are plotted. If the diagram shows one point against s; it implies that the equilibrium is stable and the trajectory converges to it. If it shows two points, then the trajectory has one maximum and one minimum point, implying an emergence of a limit cycle. Figure 3(A) roughly indicates that the equilibrium point is locally stable for smaller values of s; loses its stability bifurcating to a limit cycle for medium values and then gains stability for larger values. Figure 3(B) is an enlargement of Figure 3(A) around the two threshold values, s and s : If s < s ; the Kaldor system generates a stable equilibrium. As s passes s ; the trajectories of the system converges to a stable limit cycle with the radius equal to the distance between the upper and lower red branches. On the other hand, for s 2 [s ; s ] ' [0:281; 0; 283], 6 cyclic dynamics can emerge. Notice that the dotted vertical lime at s = 0:3 crosses the bifurcation diagram twice in Figure 3(B) and the corresponding limit cycle is depicted in Figure 2(A). Similarly, the 5 See, for example, Lorenz (1993) 6 The value of s a is numerically obtained and the value of s is analytically determined as will be seen. 9
11 dotted vertical line at s = 0:282 crosses the blue curve twice and the red curve twice in Figure 3(B) and the subcritical Hopf bifurcation leads to multi-stability, that is, the coexistence of a stable equilibrium, an unstable limit cycle and a stable limit cycle as illustrated in Figure 2(B). A distance between the upper and lower blue branches corresponds to the radius of the unstable limit cycle. (A) 0:25 s 0:38 (B) 0:28 s 0:284 Figure 3. Bifurcation diagrams with respect to s 4.2 Kaldor-Kalecki model We now turn attention to the Kaldor-Kalecki model (2) that has the same stationary equilibrium point, (Y e ; K e ); as the Kaldor model (1). As is already mentioned, Krawiec and Szydlowski (1999) show the existence of limit cycle in the Kaldor-Kalecki model. In this section we revisit this property and compare the results in the non-delay model with the results in the delay model to nd how the delay a ect dynamics. Let Y = Y Y e and K = K K e : By linearizing (2) at the equilibrium point, we have _Y (t) = [( s)y (t) K (t)] ; (13) _K (t) = Y (t ) ( + )K (t); where 1 (0:015Y e +0:00001) 2 0:52 2 = 0:05 + (0:015Y e + 0:00001) = 15 (320)3 (K e ) 4 : 10
12 Notice that the values of and depend on the the point where they are evaluated, although their dependency is not explicitly expressed in the following. Suppose exponential solutions, Y (t) = e t u and K (t) = e t v: Then the characteristic equation is written as where and 2 + a + b + ce = 0 (14) a = ( + ) ( s); b = ( s)( + ) c = : We rst examine the non-delay case (i.e., = 0) in which the corresponding characteristic equation is reduced to 2 + a + b + c = 0: The necessary and su cient conditions for the roots of the quadratic equation to be negative if real and to have negative real parts if complex are a > 0 and b + c > 0: Under the speci ed values of the parameters, b + c > 0 always. In Figure 4, the negative sloping black curve is the locus of (s; Y e ) and the closed red curve is the locus of a = 0: The black locus crosses the red curve four times at s = s i for i = 1; 2; 3; 4: 7 It is veri ed that a < 0 inside and a > 0 outside. 8 Hence, the stationary equilibrium obtained along the black curve is locally stable for s < s 2 and s > s 3 and locally unstable for s 2 < s < s 3 where s 1 ' 0:265; s 2 ' 0:283; s 3 ' 0:346 and s 4 ' 0:416: 7 Notice that s 2 is identical with s : See footnote 6. 8 We use the green curve later when the delay model is examined. 11
13 Figure 4. Stability and instability regions We now return to equation (14) and examine the delay case (i.e., > 0). Suppose that = i! with! > 0 is a solution of the equation for some > 0: Substituting it into the equation and separating the real and imaginary parts present! 2 + b + c cos! = 0; (15)!a c sin! = 0: Thus Hence and its roots are where c 2 = (! 2 b) 2 + (!a) 2 :! 4 (2b a 2 )! 2 + b 2 c 2 = 0! 2 = 2b a2 p (2b a 2 ) 2 4(b 2 c 2 ) 2 2b a 2 = ( + ) ( s) 2 < 0: If b 2 c 2 < 0; then! + > 0 and there is only one imaginary solution, = i! + : On the other hand, if b 2 c 2 0; then both roots are negative or complex so no imaginary solution exist. In Figure 4, the green curve is the locus of b 2 c 2 = 0: It is veri ed that b 2 c 2 > 0 in the left side of the green curve and b 2 c 2 < 0 in the right side. Thus stability of Y e along the black curve is a ected by the value of s: Along the black curve, stability of Y e (as well as stability of K e ) can be switched to instability for s 1 < s < s 2 and s 3 < s < s 4 12
14 for some value of while Y e is locally unstable for s 2 < s < s 3 regardless of the value of : In case of stability switch, solving the rst equation of equation (15) for yields the partition curve 9 = 1! cos 1 2 +! + c b (16) that divides the parameter region into two subregions, stability is reserved in one subregion and stability is lost in the other subregion. Figure 5 presents the division of the (s; ) plane. For = 0 (i.e., no-delay case), as it is already con rmed, stability is lost for s 2 < s < s 3. As increases and becomes positive, we have two results. One is that as far as s 2 [s 2 ; s 3 ]; the equilibrium is locally unstable regardless of the values of (i.e., in the white region of Figure 5). The other is that the instability interval of s becomes larger. Stability is preserved in the yellow region and lost in the blue region. The boundary of these regions is the partition curve described by equation (16) that is downward-sloping for s 2 [s 1 ; s 2 ] and upward-sloping for s 2 [s 3 ; s 4 ]. The blue regions are the enlarged instability regions due to the positive delay. Figure 5. Partition of the (s; ) plane Figure 5 gives the bifurcation diagrams with respect to s and reveals the e ects caused by increasing on dynamics with respect to s from a di erent view point. The red curve is for = 0 and is identical with the one given in Figure 3(A) although multi-stability phenomenon occurred around s 2 is omitted for the sake of graphical simplicity. The blue curve is for = 5 where s is increased along the dotted line at = 5 in Figure 5 where the dotted line crosses the partition curves at points a and b: Let us denote the s-values of the 9 Solving the second equation yields the same partition curve in a di erent form. 13
15 intersections by s a ' 0:277 and s b ' 0:386. Stability is lost for s = s a and regained for s = s b : The similar bifurcation cascade is obtained for = 10 and described by the green curve. The dotted line at = 10 crosses the partition curves at points A and B whose s-values are s A ' 0:274 and s B ' 0: Stability is lost for s = s A and regained for s = s B : Since qualitatively di erent dynamics arises according to s < s 2 or s > s 2 ; we rst consider dynamics for s > s 2 : In Figure 6(A) where the bifurcation diagrams are expanding as increases, we observe the following, (i) the equilibrium point bifurcates to a limit cycle when s crosses the downwardsloping partition curve; (ii) the amplitude (or ups and downs) of the cycle becomes larger as delay becomes larger as illustrated by the expansion of the bifurcation diagrams; (iii) the stability-regain value of s increases as becomes larger, implying that the larger delay has the stronger destabilizing e ect by expanding the instability region more. We turn attention to dynamics for s < s 2 to nd that it is harder to generate multi-stability as becomes larger. In Figure 6(B) the red curve describes the bifurcation diagrams for s < s 2 ; which is the same as Figure 3(B) without the blue curves. We increase the value of from 1 to 7 and denote the corresponding threshold values of s determined by equation (16) as k for k = 1; 2; :::; 7: Notice that stability is lost for s = k for = k since the real parts of the eigenvalues are zero. The black curves ending at the red dotted line at s = k imply that multi-stability occurs for s between the starting point of the black curves and the ending point for = k: It is observed that the lengths of the black curves become shorter with larger length of delay. Furthermore, for = 7; the black curves almost disappear. Therefore it becomes harder to have multi-stability as increases. 10 In Figure 5, s A is not labelled to avoid confusion. 14
16 (A) Shift due to delay (B) Multi-stability Figure 6. Bifurcation diagrams with respect to s We perform two more numerical simulations to see how the stable equilibrium is destabilized via increasing value of (i.e., the delay e ect). In the above simulations we change the value of s with xed value of : In these simulations, we increase the value of ; taking the value of s xed. In the rst example, we take = 5 and s ' 0:277 2 [s 1 ; s 2 ] that is obtained via equation (16). For = 0; the equilibrium is locally asymptotically stable. When arrives at the downward-sloping partition curve at = 5, stability is lost and further increased induces the equilibrium to bifurcate to a limit cycle. Figure 7(A) shows a bifurcation diagram with respect to : It is seen rst that the red curve jumps to a limit cycle at 1 = 5 via a subcritical Hopf bifurcation. It is further seen that the blue curve appears for 0 ' 3:45; implying the occurrence of multi-stability for 2 [ 0 ; 1 ]. It is also veri ed that the occurrence of multi-stability becomes harder as the value of increases. In the second example, we change the value of s to s ' 0:386 2 [s 3 ; s 4 ]. The increasing arrives at the upward-sloping partition curve for 1 = 5. Figure 7(B) indicates that the stable equilibrium loses stability at = 1 and bifurcates to a limit cycle via supercritical Hopf bifurcation. Summarizing the delay e ects obtained above gives the following results: (i)the equilibrium point bifurcates to a limit cycle via supercritical Hopf bifurcation when increasing crosses the upward-sloping partition curve and via subcritical Hopf bifurcation when it crosses the downward-sloping partition curve; 15
17 (ii) Multi-stability can happen with respect to delay. (A) s ' 0:277 (B) s ' 0:386 Figure 7. Bifurcation diagrams with respect to 5 Concluding Remark We investigate the Kaldor-Kalecki model in which the investment function has a S-shaped form and a gestation lag of investment between "investment decision" and "investment installation." The main analysis can be divided into two parts. In the rst part, with a constant level of the capital stock, short-run dynamics of national income is examined and two results are obtained. First, the delay does not a ect asymptotical dynamics in the sense that no stability switch occurs for any values of the delay. Second, the convergence speed gets faster as the delay becomes larger. In the second part, evolution of national income and the capital accumulation are simultaneously examined. Two nonlinear phenomenon, the birth of a limit cycle and coexistence of stable and unstable limit cycles around the stabile equilibrium point, both of which can emerge without delay, are preserved even if the delay is introduced. However it is numerically con rmed that the amplitude of trajectory s uctuations becomes larger as the delay becomes larger. It can be concluded that the delay a ects the long-run as well as short-run dynamics quantitatively but not qualitatively. 16
18 References [1] Beddington, J. and May, R. (1975), Time delays are not necessarily destabilizing, Mathematical Biosciences, 27, [2] Chang, W. and Smyth, D. (1971), The existence and persistence of cycles in a nonlinear model: Kaldor s 1940 model re-examined, Review of Economic Studies, 38, [3] Grasman, J. and Wentzel, J. (1994), Co-existence of a limit cycle and an equilibrium in Kaldor s business cycle model and its consequences, Journal of Economic Behavior and Organization, 24, [4] Ichimura, S. (1955), Toward a general nonlinear macrodynamics theory of economic uctuations, in Post-Keynesian Economics, ed. K. Kurihira, , Longon, Gerge Allen&Unwin. [5] Kadder, A. and Talibi Alaudi H. (2008) Hopf bifurcation analysis in a delayed Kaldor-Kalecki model of business cycle," Nonlinear Analysis: Modelling and Control, 439, [6] Kaldor, N. (1940), A model of the trade cycle, Economic Journal, 50, [7] Kalecki, M. (1935), A macrodynamic theory of business cycles, Econometrica 3, [8] Krawiec, A. and Szydlowski, M. (1999), The Kaldor-Kalecki business cycle model, Annals of Operations Research, 89, [9] Lorenz, H-W. (1993), Nonlinear Dynamical Economics and Chaotic Motion, second, revised and enlarged edition, Springer-Verlag, Berlin/Heidleberg/New York. [10] Lorenz, H-W. (1987), Strange attractors in a multisector business cycle model, Journal of Economic Behavior and Organization, 8, [11] Zhou, L. and Li, Y. (2009), A dynamic IS-LM business cycle model with two time delays in capital accumulation equation," Journal of Computational and Applied Mathematics, 228,
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Jamie Oliver's Naked Chef was my first exposure to Jamie Oliver about 15 years ago! (Wow, I feel old!!) I would love watching his show on TVO along side Two Fat Ladies and Jacques Pepin. Watching cooking shows was always one of my favourite pass time when I was younger, but Jamie's shows really got me wanting to cook and experiment different recipes. His passion for good food, healthy eating, and his strong advocacy and education for healthier school systems is truly inspiring.
Jamie has a new book called "Everyday Super Food" which came out earlier this month in Canada. The book is amazing! The first section of the book features healthy recipes for every meal of the day plus also snacks and drinks. But my favourite part of the book is how he writes about protein, fats, carbs, effects of water & alcohol consumption and so many more interesting life changing topics. Another neat thing about this cook book is that Jamie actually took all the photos himself and even studied nutrition so that all the nutritional values are listed for each recipe! I won't spoil it all for you, but make sure you pick up a copy and start living happier and healthier! You can buy it online at Indigo.
Along side his new book, Jamie has a new show on Food Network as well. Jamie's Super Food features recipes from his book but he also visits countries that have the longest living people. He then cooks recipes that are inspired by those countries. Indigo Green Room had a private screening of Jamie's Super Food and Jamie even answered a couple of questions. Jamie's high energy and intensity makes you glued to the screen. The food he cooks look phenomenal and I cannot wait to try some recipes soon! The show airs on Sundays at 11am on Food Network Canada.
Jamie will also be opening up his first North American restaurant in Yorkdale mall in December of this year. Jamie's Italian is already around the world already but I am thrilled that we finally get one in Toronto. Can't wait to try it!
Here is one recipe that looked so amazing on the show, Tasty Fish Tacos. You can check out the recipes here and also see other great recipes from Jamie's Super Food.
Thank you Indigo for having me at this great event!


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(KAIT) - Over the weekend, four lives were lost when the vehicle they were in collided with a train.
That crash is one of several rail crossing crashes in the news lately.
Most of the time, when a train hits a car, it doesn't end well.
The good news is the crashes and deaths are going down, but just one death is too many.
We probably all know someone who lost their life at a rail crossing. I know I do.
I think about him every time I cross a set of tracks. The life lost. His family then, now, and what might have been.
It's been twenty years since I lost my friend.
There are so many more distractions these days.
I think our heads are in so many more places these days too.
It seems as though driving has become passé.
We can drive with our eyes closed all the way home - my car just knows the way.
It's time we take control back. When you cross the railroad tracks, pay attention.
Trains can't stop on a dime - so we have to. Stop, Look, Listen.
Copyright 2018 KAIT. All rights reserved.


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Moderated Discussion Areas
ContinuousWave: Whaler Performance
110 SPORT Re-power with 25-HP
|Topic: 110 SPORT Re-power with 25-HP
posted 02-15-2015 11:59 AM ET (US)
I have a 110 SPORT with a Mercury 25. The boat is rated for 25-HP, but I would like to put on an E-TEC 30. The two [areas of performance] I am trying to improve are trouble getting up on plane with four passengers and as well as vibration in the console when at idle. The E-TEC being a two-cycle engine with power on each stroke should run smoother at low speed. Any thoughts?
posted 02-16-2015 08:28 AM ET (US)
The E-TEC 30-HP is an 863-cc displacement in-line two-cylinder. I don't think even the most die-hard fan of the E-TEC would suggest that any two-cylinder two-cycle is going to be the smoothest, most vibration-free engine in the world. I don't have any first-hand experience with this engine, but based on the 90-HP three-cylinder, which is using three cylinder of the same size as this 30-HP, the engine should have plenty of power, as it is making just 15-HP per cylinder compared with the 30-HP per cylinder of the 90-HP model.
posted 02-17-2015 09:00 AM ET (US)
Nauti, the first thought would be to make sure you're OK with your insurance company, both for any boat insurance you carry, and even more importantly, for personal liability. You'd hate to have a mishap and not be covered.
On the vibration side, it's hard to say whether the eTec will help - it probably will, but may vibrate at other speeds, as vibrations like the one you describe are usually caused by resonance. You may also want to make sure nothing is loose on the console, or even install a damping product such as Dynamat to the inside panels of the console.
posted 02-17-2015 02:27 PM ET (US)
I think if you want to carry four passengers, you should consider a bigger boat. Stepping up to even a 13' Whaler would give you much more room and be much more comfortable.
posted 02-17-2015 05:56 PM ET (US)
I don't want four adults on my Sport 13. I've had three aboard and that was enough. Three adults can almost barely fish on the 13 if they are very friendly and considerate. For three adults cruising is about all that can be done in any comfort.
I would get a 15 if I would be regularly hosting three passengers.
posted 02-19-2015 08:39 AM ET (US)
I overlooked the 11-foot boat in the discussion. It seems quite unreasonable to expect to go about on plane in an 11-foot boat with four adult passengers, unless one were operating in the most protected water.
I think you'll take a bath on the economics of re-powering. A better investment would be a larger boat.
posted 02-20-2015 09:49 AM ET (US)
I find two medium sized adults and two kids on board is about maximum with my 13-footer. I also think the weight of the E-TEC 30 would be on the heavy side for a 11-footer. And I don't think there would be much difference in performance factoring the extra stern weight. One thought is to get a lower pitch propeller for your Mercury 25, if you typically have more passengers on board.
posted 02-21-2015 09:18 AM ET (US)
Being an owner of an E-TEC 30 hp, I would not recommend it for an 11' Whaler based on weight. Too much for the 11, pretty well tolerated by the 13.
As far as vibration-free and smoothness: In my opinion, remarkable.
Very quiet and smooth at idle, and virtually vibration-free at harbor speed.
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters . One of the very common H-bridge ICs available in the market is LB or. LD It is always advised to go through the datasheet of the ICs before using them. DESCRIPTION. The Device is a monolithic integrated high volt- age, high current four channel driver designed to accept standard DTL or TTL logic levels and.
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The LB and LE are package in 16 and Push-pull four channel drivers.
Access Denied
L no D is comparable to LB. Je kunt hier ook in het Nederlands terecht: Low Voltage Inhibit Current. No availability reported, please contact our Sales office. Media Subscription Media Contacts. L293b datasheet Home and City Smart Industry. By continuing your visit on our website, you consent to l293b datasheet cookies in accordance with ST Dxtasheet Policy.
ST Code of Conduct Blog. No, they are not fast diodes. Storage and Junction Temperature. Product is in design feasibility stage. But sometimes you l293b datasheet don't have a need for a motor to run in 2 directions. Did you connect the l293b datasheet
LB – Push-Pull Four Channel Drivers – STMicroelectronics
So you can do with just one driver. Who We Are Management. General terms and l293b datasheet.
Those diodes will from a short circuit to the reversed voltage, but not for the output signal. Product is in design stage Target: A separate supply in. Have a look at "blink without delay". L293b datasheet Products Explore our product portfolio.
LB Datasheet(PDF) – STMicroelectronics
Now with Unlimited Eagle board sizes! STMicroelectronics products are not. Product is in volume datqsheet. No commitment taken to design or produce NRND: The LB and LE are quad push-pull drivers. Output Voltage versus Inhibit Voltage. L293b datasheet you need to control 2 directions, you l293b datasheet a full bridge. As far as I know the LD is rated as 0.
Output Voltage versus Input L293b datasheet. Specifications mentioned in this publication are subject. C and the soldering time must not be longer. V i each channel.