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In economics, a recession is a business cycle contraction, a general slowdown in economic activity. During recessions, many macroeconomic indicators vary in a similar way. Production, as measured by Gross Domestic Product (GDP), employment, investment spending, capacity utilization, household incomes, business profits and inflation all fall during recessions; while bankruptcies and the unemployment rate rise.
Recessions generally occur when there is a widespread drop in spending often following an adverse supply shock or the bursting of an economic bubble. Governments usually respond to recessions by adopting expansionary macroeconomic policies, such as increasing money supply, increasing government spending and decreasing taxation.
n a 1975 New York Times article, economic statistician Julius Shiskin suggested several rules of thumb for defining a recession, one of which was "two down quarters of GDP". In time, the other rules of thumb were forgotten. Some economists prefer a definition of a 1.5% rise in unemployment within 12 months.
In the United States, the Business Cycle Dating Committee of the National Bureau of Economic Research (NBER) is generally seen as the authority for dating US recessions. The NBER defines an economic recession as: "a significant decline in [the] economic activity spread across the country, lasting more than a few months, normally visible in real GDP growth, real personal income, employment (non-farm payrolls), industrial production, and wholesale-retail sales." Almost universally, academics, economists, policy makers, and businesses defer to the determination by the NBER for the precise dating of a recession's onset and end.
The bursting of a real estate or financial asset price bubble can cause a recession. For example, economist Richard Koo wrote that Japan's "Great Recession" that began in 1990 was a "balance sheet recession." It was triggered by a collapse in land and stock prices, which caused Japanese firms to become insolvent, meaning their assets were worth less than their liabilities. Despite zero interest rates and expansion of the money supply to encourage borrowing, Japanese corporations in aggregate opted to pay down their debts from their own business earnings rather than borrow to invest as firms typically do. Corporate investment, a key demand component of GDP, fell enormously (22% of GDP) between 1990 and its peak decline in 2003. Japanese firms overall became net savers after 1998, as opposed to borrowers. Koo argues that it was massive fiscal stimulus (borrowing and spending by the government) that offset this decline and enabled Japan to maintain its level of GDP. In his view, this avoided a U.S. type Great Depression, in which U.S. GDP fell by 46%. He argued that monetary policy was ineffective because there was limited demand for funds while firms paid down their liabilities. In a balance sheet recession, GDP declines by the amount of debt repayment and un-borrowed individual savings, leaving government stimulus spending as the primary remedy.
There is no commonly accepted definition of a global recession, although the IMF regards periods when global growth is less than 3% to be global recessions.[34] The IMF estimates that global recessions seem to occur over a cycle lasting between 8 and 10 years.[citation needed] During what the IMF terms the past three global recessions of the last three decades, global per capita output growth was zero or negative.[35]
Economists at the International Monetary Fund (IMF) state that a global recession would take a slowdown in global growth to three percent or less. By this measure, four periods since 1985 qualify: 1990–1993, 1998, 2001–2002 and 2008–2009.

-source: Wikipedia-