 When every credit is matched by an equal and opposite debt, which is to say when there is no money and no interest, then supply equals demand "a priori", and all the problems of economic equilibrium go away.Similarly, the very politicised question of the size of the money supply is solved because the credit is perfectly elastic; it is available in whatever quantity the debtor is trusted to repay.Without interest on deposits, there is no reason to hoard credit – all credit is treated as a short-term loan between trusted partners, though many systems make provision for default similar to insurance.