【專題】宏觀經(jīng)濟(jì)學(xué)：unemploymentrate
　　【問題】
　　holding the working-agepopulation constant, if the labor force participation rate declines while thenumber of people employed remains unchanged, the unemployment rate is mostlikely to
　　A. increase
　　B. decrease
　　C. remain unchanged.
　　答案是B?？墒莡nemployment rate不是等于no. of unemployed/laborforce么？ 題干里說labor force減小了，其他remainunchanged,那unemployment rate 不是應(yīng)該increase么？
　　【專家解答】
　　labor force participation rate=（unemployed +employed）/working-age population
　　題目中說“the number of peopleemployed remains unchanged”，” holding the working-agepopulation constant”，也就是就業(yè)人數(shù)不變，工作年齡人口數(shù)量不變，而勞動(dòng)參與率下降，所以，laborforce數(shù)量減少，unemployed數(shù)量減少。
　　unemployment rate=unemployed/labor force=unemployed/（unemployed+employed）=1/（1+ employed/unemployed）
　　由于employed不變，unemployed減少，因此employed/ unemployed變大，進(jìn)而unemployment rate分母項(xiàng)變大，所以u(píng)nemployment rate變小。