Answer:
Economic growth can be caused by random fluctuations, seasonal fluctuations, changes in the business cycle, and long-term structural causes. Policy can influence the latter two.
Business cycles refer to the regular cyclical pattern of economic boom (expansions) and bust (recessions). Recessions are characterized by falling output and employment; at the opposite end of the spectrum is an “overheating” economy, characterized by unsustainably rapid economic growth and rising inflation. Capital investment spending is the most cyclical component of economic output, whereas consumption is one of the least cyclical. Government can temper booms and busts through the use of monetary and fiscal policy. Monetary policy refers to changes in overnight interest rates by the Federal Reserve. When the Fed wishes to stimulate economic activity, it reduces interest rates; to curb economic activity, it raises rates. Fiscal policy refers to changes in the federal budget deficit. An increasing deficit stimulates economic activity, whereas a decreasing deficit curbs it. By their nature, policy changes to influence the business cycle affect the economy only temporarily because booms and busts are transient. In recent decades, expansions have become longer and recessions shallower, perhaps because of improved stabilization policy, or perhaps because of good luck.