The Friedman-Phelps Analysis Shows That a Negative Relationship Between Inflation

Multiple Choice

The Friedman-Phelps analysis shows that a negative relationship between inflation and unemployment holds

A) even when expected inflation changes.
B) even when the natural rate of unemployment changes.
C) even if both the expected inflation rate and the natural rate of unemployment change.
D) as long as the expected inflation rate and the natural rate of unemployment are approximately constant.