Real GDP is a measure of the value of economic output adjusted for price changes, which include inflation and deflation. The graph shows the real GDP from January of 1980 until March of 2018. The shades gray areas are the periods of recession. The regularly upward long-term graph is interrupted by short-term declines. These are the periods of recession. This can be seen in the period from 2008-2009 during the Great Recession. During these periods, employment and production are both greatly affected. Whenever real GDP falls, so does unemployment and vice versa. The slowdown in production causes firms to lay off or even fire some of the workers that they have. The workers that remain after these cuts will probably not receive a very good raise, and they might even be asked to take pay cuts.