“Your current account will no longer be held with a bank, but with the government or the central bank. Banks still exist, and still lend money, but they get their funds from the central bank, not from depositors. Having everyone’s account at a single, central institution allows the authorities to either encourage or discourage people to spend. To boost spending, the bank imposes a negative interest rate on the money in everyone’s account – in effect, a tax on saving. Faced with seeing their money slowly confiscated, people are more likely to spend it on goods and services. When this change in behaviour takes place across the country, the economy gets a significant fillip.”
http://www.telegraph.co.uk/finance/personalfinance/comment/11602399/Ban-cash-end-boom-and-bust.html