Suppose that the US presidential election of 1932 had, in fact, taken place in 1930, at an early stage in the Great Depression. Suppose, too, that Franklin Delano Roosevelt had won then, though not by the landslide of 1932. How different subsequent events might have been. The president might have watched helplessly as output and employment collapsed. The decades of Democratic dominance might not have happened.

On such chances the wheel of history turns. But this time was different: the crisis brought Barack Obama to power close to the beginning of the economic collapse.

I (among others) then argued that policy needed to be hugely aggressive. Alas, it was not. I noted on February 4 2009, at the beginning of the new presidency: “Instead of an overwhelming fiscal stimulus, what is emerging is too small, too wasteful and too ill-focused.” A week later, I asked: “Has Barack Obama’s presidency already failed? In normal times, this would be a ludicrous question. But these are not normal times. They are times of great danger. Today, the new US administration can disown responsibility for its inheritance; tomorrow, it will own it. Today, it can offer solutions; tomorrow it will have become the problem. Today, it is in control of events; tomorrow, events will take control of it. Doing too little is now far riskier than doing too much.” This was right.