118 36. FINANCIAL AND CAPITAL RIsk MANAGEMENT (CONTINUED) (B) Aud / uSd (C) CRediT RiSk (d) liquidiTy RiSk The contractual maturity of the Group’s fixed and floating rate derivatives, other financial assets and other financial liabilities are  shown in the tables below. The amounts represent the future undiscounted principal and interest cash flows and therefore may  not equate to the values disclosed in the balance sheet. Refer to Note 19(B) for details of the Group’s unused credit facilities at 30 June 2013.  To help reduce this risk the Group: Liquidity risk is the risk that the Group cannot meet its financial commitments as and when they fall due. Refer to Note 8 for an ageing analysis of trade receivables and the movement in the provision for doubtful debts. All other  financial assets are not impaired and are not past due. Based on the credit history of these classes, it is expected that these  amounts will be received when due. Financial assets are considered impaired where there is objective evidence that the Group will not be able to collect all amounts  due according to the original trade and other receivable terms. Factors considered when determining if an impairment exists  include ageing and timing of expected receipts and the credit worthiness of counterparties. A provision for doubtful debts is  created for the difference between the assets carrying value and the present value of estimated future cash flows. The Group’s  trading terms do not generally include the requirement for customers to provide collateral as security for financial assets. The Group’s credit risk is mainly concentrated across a number of customers and financial institutions. The Group does not  have any significant credit risk exposure to a single or group of customers or individual institutions. The Group is exposed to credit risk on financial instruments and derivatives. For credit purposes, there is only a credit risk where  the contracting entity is liable to pay the Group in the event of a closeout. The Group has policies that limit the amount of credit  exposure to any financial institution. Derivative counterparties and cash transactions are limited to financial institutions that  meet minimum credit rating criteria in accordance with the Group’s policy requirements. At 30 June 2013 counterparty credit  risk was limited to financial institutions with S&P credit ratings ranging from A to AA. Credit risk is the risk that a contracting entity will not complete its obligations under a financial instrument and cause the Group  to make a financial loss. The Group has exposure to credit risk on all financial assets included in the Group’s balance sheet. To  help manage this risk, the Group: Comparing the Australian Dollar exchange rate against the United States Dollar, a 15% weaker Australian Dollar would result in  an exchange rate of 0.7763 and a 15% stronger Australian Dollar in an exchange rate of 1.0503 based on the year end rate of  0.9133. This range is considered reasonable given over the last five years, the Australian Dollar exchange rate against the United  States Dollar has traded in the range of 0.6120 to 1.1028. IMPACT ON POST-TAX PROFIT IMPACT ON EQUITY (CASH FLOW HEDGE RESERVE) 2013 $’000 2012 $’000 2013 $’000 2012 $’000 If the AUD exchange rate was 15% weaker against the USD with all other  variables held constant – increase/(decrease)  1   (1)  (1,249)  (1,496) If the AUD exchange rate was 15% stronger against the USD with all other  variables held constant – increase/(decrease)  (3)  (148)  1,786   2,955  • has a policy for establishing credit limits for the entities it deals with; • may require collateral where appropriate; and • manages exposures to individual entities it either transacts with or enters into derivative contracts with (through a system of  credit limits). • has a liquidity policy which targets a minimum level of committed facilities and cash relative to EBITDA; • has readily accessible funding arrangements in place; and • staggers maturities of financial instruments. NOTEs TO THE FINANCIAL sTATEMENTs  FAIRFAx MEDIA LIMITED AND CONTROLLED ENTITIES FOR THE PERIOD ENDED 30 JUNE 2013