Answer:
b. 6 months to 18 months
Explanation:
Recession refers to the state of the business cycle contract when the economy declined for six months or more. There are five economic indicators which are studied and observed by the National Bureau of Economic Research and they include real gross domestic product, employment, income, manufacturing, and retail sales. In the United States, the memories of the recession period were painful part of business cycles. There are many occasions of recession in the United States between 1950 and 2009 but none extended 18 months. The worst among them was The great depression of 2008 to 2009.
