depression
A recession is a bad season; a depression is a long, brutal winter. When a downturn is not just deep but also drags on for years, when unemployment climbs to extraordinary levels and stays there, when prices and wages spiral downward and banks fail in waves — that is a depression. It is the same kind of slump as a recession, only far more severe and far more lasting.
There is no single agreed numerical definition, but the rough idea is a decline in output and employment that is much larger and longer than an ordinary recession — say output falling by 10 percent or more, or a contraction lasting several years rather than several quarters. The defining historical case is the Great Depression of the 1930s, when U.S. output fell by roughly a quarter, about a quarter of the workforce was jobless, prices fell sharply (deflation), and the misery spread worldwide. Because depressions are rare and catastrophic, the word is used sparingly; most downturns are 'merely' recessions.
The reason economists obsess over depressions is that they are partly self-feeding. Falling spending causes layoffs, which cut incomes, which cut spending further; falling prices make debts heavier in real terms, prompting more cutbacks. This vicious spiral is why modern policy — deposit insurance, central banks acting as lenders of last resort, large fiscal responses — is largely designed to stop a recession from snowballing into a depression. A common confusion is to use 'depression' loosely for any bad year; properly it means a slump of historic, economy-wrecking scale.
In the early 1930s, queues of jobless workers stretched around city blocks for years, not months; farms were abandoned, savings vanished as banks collapsed, and global trade roughly halved. That sustained, economy-wide collapse — far beyond an ordinary recession — is what 'depression' names.
The Great Depression: a downturn so deep and long it became the benchmark for the word.
Depression is a matter of degree, not a different mechanism — it is a recession that became severe and prolonged. The fear of one is precisely why deflation and bank failures are treated as emergencies.