Redefining recession

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: that America and Britain have faster trend growth rates than Japan or the euro area. The bottom-right chart shows that since the third quarter of last year, growth has been below trend in all four economies, but Britain, closely followed by America, has seen the biggest drop relative to potential.

But even if this is a better definition of recession, potential growth rates are devilishly hard to measure and revisions to GDP statistics are still a problem. One solution is to pay much more attention to unemployment numbers, which, though not perfect, are generally not subject to revision and are more timely. A rise in unemployment is a good signal that growth has fallen below potential. Better still, it matches the definition of recession that ordinary people use. During the past half-century, whenever America’s unemployment rate has risen by half a percentage point or more the NBER has later (often much later) declared it a recession. European firms are slower at shedding jobs, so unemployment may be a lagging indicator. Even so, the jobless rate has usually started to rise a few months after the start of a recession.

As the old joke goes: when your neighbour loses his job, it is called an economic slowdown. When you lose your job, it is a recession. But when an economist loses his job, it becomes a depression. Economists who ignore the recent rise in unemployment deserve to lose their jobs.