In the last sentence of this passage there appears the root of Hobson's mistake, namely, his supposing that it is a ease of excessive saving causing the actual accumulation of capital in excess of what is required, which is, in fact, a secondary evil which only occurs through mistakes of foresight; whereas the primary evil is a propensity to save in conditions of full employment more than the equivalent of the capital which is required, thus preventing full employment except when there is a mistake of foresight.