The examples and perspective in this article deal primarily with
A depression is an unusual and extreme form of recession. Depressions are characterized by their length, by abnormally large increases in
There are also differences in the duration of depression across definitions. Some economists refer only to the period when economic activity is declining. The more common use, however, also encompasses the time until economic activity has returned close to normal levels.
A recession is briefly defined as a period of declining economic activity spread across the economy (according to NBER). Under the first definition, each depression will always coincide with a recession, since the difference between a depression and a recession is the severity of the fall in economic activity. In other words, each depression is always a recession, sharing the same starting and ending dates and having the same duration.
Under the second definition, depressions and recessions will always be distinct events however, having the same starting dates. This definition of depression implies that a recession and a depression will have different ending dates and thus distinct durations. Under this definition, the length of a depression will always be longer than that of the recession starting the same date.
A useful example is the difference in the chronology of the Great Depression in the U.S. under the view of alternative definitions. Using the second definition of depression, most economists refer to the Great Depression, as the period between 1929 and 1941. On the other hand, using the first definition, the depression that started in August 1929 lasted until March 1933. Note that NBER, which publishes the recession (instead of depression) dates for the U.S. economy, has identified two recessions during that period. The first between August 1929 and March 1933 and the second starting in May 1937 and ending in June 1938.