Why does banking generate such turmoil, with the crisis over securitised lending the latest example? Why is the industry so profitable? Why are the people it employs so well paid? The answer to these three questions is the same: banking takes high risks. But the public sector subsidises this risk-taking. It does so because banks provide a utility. What the banks give in return, however, is gung-ho speculation.

Perhaps the most striking characteristic of the banking sector is its profitability. Between 1997 and 2006, for example, the median nominal return on equity of UK banks was 20 per cent. While high by international standards, this seems not to be exceptional. In 2006, returns on equity were about 20 per cent in Ireland, Spain and the Nordic countries. In the US they were a little over 12 per cent. Returns in Germany, France and Italy seem to have been close to US levels.