As Governor of the Bank of England Sir Mervyn King told us in 2010: 'Of all the many ways of organising banking, the worst is the one we have today.'Notes and coins are irredeemable: the promise to pay the bearer on demand cannot be fulfilled, except with another note or coin with the same face value. Notes and coins are tokens worth less than their face value and are issued lawfully and exclusively by the state. This is fiat money.When this money is deposited at the bank it becomes the bank's property and a liability. The bank does not retain a full reserve on demand deposits. In the days of gold as money, fractional reserves on demand deposits explained how banks created credit. Today, credit expansion is not bounded by the redemption of notes, coins, and bank deposits in gold.Because banks are funded by demand deposits but create credit on longer terms, they are risky investment vehicles subject to runs in a loss of confidence. States have come to provide taxpayer-funded deposit insurance. This subsidises commercial risk, producing more of it and creating moral hazard amongst depositors who need not concern themselves with the conduct of banks.The state also provides a privileged lender of last resort: the central bank. It lends to illiquid but solvent banks getting them through moments of crisis. In a fiat money system, central banks have the power to create reserves and otherwise intervene openly in the money markets. Today this is most evident in the purchase of government bonds with new money, so-called quantitative easing.The central banks also manipulate interest rates in the hope of maintaining a particular rate of price inflation through just the right rate of credit expansion to match economic growth. That otherwise free-market economists and commentators support such obvious economic central planning is one of the absurdities of contemporary life.Compounding these flaws is the limited liability corporate form. Whereas limited liability was introduced to protect stockholders from rapacious directors, its consequence today is ensuring no one taking commercial risks within banks stands to share in the downside. This creates further moral hazard.Regulatory decisions have been taken to encourage banks to make bad loans and dispose of them irresponsibly. Among these are the US Community Reinvestment Act and the present government's various initiatives to promote the housing market and further credit expansion.Having insisted banks make bad loans, the regulatory state imposed the counterproductive International Financial Reporting Standards (IFRS) which can over-value assets and over-state the capital position of banks. This drives the creation of financial products and deals which appear profitable but which are actually loss-making. Since these notoriously involve vast quantities of instruments tied to default, the system is booby-trapped.Amongst the many practical consequences of these policies was the tripling of the money supply (M4) in the UK from £700 billion in 1997 to £2.2 trillion in 2010. Credit expansion at this rate has had predictable and profound consequences including asset bubbles, sectoral and geographic imbalances, unjust wealth inequality, erosion of physical capital, excess consumption over saving, and the redirection of scarce resources into unsustainable uses.Moreover, credit cannot be expanded without limit. Eventually, the real world catches up with credit not backed by tangible assets: booms are followed by busts.