America clocked up a record last week. The latest drop in house prices meant that the cost of real estate has fallen by 33% since the peak – even bigger than the 31% slide seen when John Steinbeck was writing The Grapes of Wrath.

Unemployment has not returned to Great Depression levels but at 9.1% of the workforce it is still at levels that will have nerves jangling in the White House. The last president to be re-elected with unemployment above 7.2% was Franklin Delano Roosevelt.

The US is a country with serious problems. Getting on for one in six depend on government food stamps to ensure they have enough to eat. The budget, which was in surplus little more than a decade ago, now has a deficit of Greek-style proportions. There is policy paralysis in Washington.

The assumption is that the problems can be easily solved because the US is the biggest economy on the planet, the only country with global military reach, the lucky possessor of the world’s reserve currency, and a nation with a proud record of re-inventing itself once in every generation or so.

All this is true and more. US universities are superb, attracting the best brains from around […]