单选题 For an economy operating at full employment, if actual inflation is less than expected inflation, what will most likely be the effects on the unemployment rate in the short run and in the long run? Short run Long run ①A. Increase Increase ②B. Decrease No effect ③C. Increase No effect A. ①B. ②C. ③

【正确答案】 C

【答案解析】Using the Phillips curve model, if actual inflation is less than expected inflation, the short-run effect is to reduce GDP growth and increase the unemployment rate. If the lower inflation rate is maintained, in the long run it becomes the new expected inflation rate, and unemployment returns to its natural rate.