Diagnosing depression

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: The word “depression” is popping up more often than at any time in the past 60 years, but what exactly does it mean? The popular rule of thumb for a recession is two consecutive quarters of falling GDP. America’s National Bureau of Economic Research has officially declared a recession based on a more rigorous analysis of a range of economic indicators. But there is no widely accepted definition of depression. So how severe does this current slump have to get before it warrants the “D” word?

A search on the internet suggests two principal criteria for distinguishing a depression from a recession: a decline in real GDP that exceeds 10%, or one that lasts more than three years. America’s Great Depression qualifies on both counts, with GDP falling by around 30% between 1929- 1933. Output also fell by 13% during 1937-1938. The Great Depression was America’s deepest economic slump (excluding those related to wars), but at 43 months it was not the longest: that dubious honour goes to the one in 1873-79, which lasted 65 months.

Japan’s “lost decade” in the 1990s was not a depression, according to these criteria, because the largest peak-to-trough decline in real GDP was only 3.4%, over the two years to March 1999. Since the second world war, only one developed economy has suffered a drop in GDP of more than 10%: Finland’s contracted by 11% during the three years to 1993, mainly thanks to the collapse of the Soviet Union, then its biggest trading partner.

Emerging economies, however, have been much more depression-prone. Among the 25 emerging economies covered each week in the back pages of The Economist, there have been no fewer than 13 instances in the past 30 years of a decline in real GDP of more than 10%. Argentina and Poland were afflicted twice. Indonesia, Malaysia and Thailand all suffered double-digit drops in output during the Asian crisis of 1997-98, and Russia’s GDP shrank by a shocking 45% between 1990 and 1998.

The left-hand chart shows The Economist’s ranking of slumps in developed and emerging economies over the past century. It excludes those during wartime (both Germany and Japan saw output plunge by 50% or more after 1944). The depressions in Germany and France in the 1930s make it into the top 12, but not that in Britain, where GDP fell by a relatively modest 6%.