单选题 Which of these factors is least likely to change the natural rate of unemployment?

A. An unexpected tightening of the money supply reduces aggregate demand.
B. Long-term demographic shifts result in fewer young adults in the labor force.
C. Labor market deregulation makes it easier for workers to change jobs.

【正确答案】 A

【答案解析】The natural rate of unemployment is the sum of frictional and structural unemployment. An unexpected decrease in the money supply would bring about cyclical unemployment. The natural rate is influenced by such factors as composition and mobility of the labor force and the level of technology available in the economy.