In the Late 1960s, Which of the Following Was Published

Multiple Choice

In the late 1960s, which of the following was published by economist Edmund Phelps?

A) a paper that argued that there was no long-run tradeoff between inflation and unemployment
B) a paper that disproved Friedman's claim that monetary policy was ineffective in controlling inflation
C) a paper that showed the optimal point on the Phillips curve was at an unemployment rate of 5 percent and an inflation rate of 2 percent
D) a paper that argued that the Phillips curve was stable and that it would not shift