Doubts about the natural and the existences of the Phillips curve arose in the 1970s when the economy experienced ?

Doubts about the natural and the existences of the Phillips curve arose in the 1970s when the economy experienced ?

A. a high rate of inflation: along with a low rate of unemployment
B. simultaneously low rates of inflation and unemployment
C. simultaneously high rates of inflation and unemployment
D. a high rate of unemployment along with a low rate of inflation

In the long run, the Phillips curve will be vertical at the natural rate of unemployment if ?

In the long run, the Phillips curve will be vertical at the natural rate of unemployment if ?

A. the long-run aggregate demand curve is horizontal at the natural rate of inflation
B. the long run aggregate demand curve is vertical at potential GDP
C. the long run aggregate demand curve is vertical at potential GDP
D. The long run supply curve is horizontal at the natural rate of inflation

According to the classical economists, those who are not working ?

According to the classical economists, those who are not working ?

A. have chosen not to work at the market wage
B. have given up looking for a job but would accept a job at the current wage if one were offered to them.
C. are too productive to be hired at the current wage
D. are unable to find a job at the current wage rate