中等ECON-INFL-006
A policy tries to hold unemployment below the natural rate by raising aggregate demand. At DSE level, the Phillips-curve conclusion is:
A. The long-run Phillips curve shifts left, so any inflation rate buys permanently lower unemployment
B. The short-run trade-off is a vertical line at every inflation rate
C. The currency board must move the weak-side rate to 7.75
D. Inflation can rise, but unemployment does not stay below the natural rate once expectations adjust✓ 答案
解說
The short-run Phillips curve slopes down for a given expected inflation. In the long run it is vertical at the natural rate, so demand stimulus does not permanently cut unemployment below that rate. The convertibility band is a separate fact and is not reset by this policy.