The business cycle or trade cycle is a permanent feature of market economies: gross domestic product (GDP) fluctuates as booms and recessions succeed each other. During a boom, an economy (or at least parts of it) expands to the point where it is working at full capacity, so that production, employment, prices, profits, investment and interest rates all tend to rise. During a recession, the demand for goods and services falls and the economy begins to work at below its potential. Investment, output, employment, profits, commodity and share prices, and interest rates generally fall. A serious, long-lasting recession is called a depression or a slump.
The highest point on the business cycle is called a peak, which is followed by a downturn or downswing or a period of contraction. The lowest point on the business cycle is called a trough, which is followed by a recovery or an upturn or upswing or a period of expansion. Economists sometimes describe contraction as 'negative growth'.