EXPANSION: A phase of the business cycle characterized by a general period of rising economic activity. An expansion is one of two basic business cycle phases. The other is contraction. The transition from expansion to contraction is termed a peak and the transition from contraction to expansion is termed a trough. Expansions last an average of about 3-4 years, but this by no means not guaranteed. An expansion in the early 1980s lasted a mere 12 months. The next expansion then lasted over 8 years. Much of the 1960s was dedicated to a 106-month expansion, almost 9 years. See also | business cycle | prosperity | contraction | peak | trough | real gross domestic product | full employment | unemployment rate | inflation | investment | consumption | investment business cycle | political business cycle |