Lord Turner is the UK’s man for all seasons. A few years ago, he fixed pensions. Today, it is finance. The report by the new chairman of the UK’s Financial Services Authority is a turning point.* The authorities of a country that used to boast of its light financial regulation have changed their minds: the UK has lost confidence in its financial sector.

“Over the last 18 months, and with increasing intensity over the last six, the world’s financial system has gone through its greatest crisis for at least half a century, indeed arguably the greatest crisis in the history of finance capitalism.” This is the report’s starting point. It advances two explanations for this disaster: exceptional macroeconomic conditions – particularly the emergence of excess savings in large parts of the world – and reliance on “the theory of efficient and rational markets”. As the report notes, “the predominant assumption behind financial market regulation – in the US, the UK and increasingly across the world – has been that financial markets are capable of being both efficient and rational”. So regulators were expected to stay out of the way. In the report’s new view, they should be in the way, instead. The financial sector no longer enjoys the benefit of the doubt: it may burn up the world.