Since the 1950s, the natural rate of unemployment in the United States has risen and fallen over time.
Since the 1950s, the United States economy grew overall by 37% where the unemployment remained low, about 4.5%. Thus, at the end of the decade, the median American family had about 30% more purchasing power than at the beginning as their income grew with time, and this has risen and fallen over time.
It is estimated that since the 1950s, the natural rate of unemployment rose which was highly driven by strong wage growth rather than a rise in inflation level.
Hence, option D is correct.
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