11. Given the annual rate of inflation, the "rule of 70" allows one to

A. determine whether the inflation is demand-pull or cost-push.
B. calculate the accompanying rate of unemployment.
C. determine when the value of a real asset will approach zero.
D. calculate the number of years required for the price level to double.

Question

11.    Given the annual rate of inflation, the "rule of 70" allows one to

A. determine whether the inflation is demand-pull or cost-push.
B. calculate the accompanying rate of unemployment.
C. determine when the value of a real asset will approach zero.
D. calculate the number of years required for the price level to double.

BlackTom AI · Accepted Answer

When approaching this economics question, I will evaluate what the Rule of 70 is used for and what each option implies.
Option A: 'determine whether the inflation is demand-pull or cost-push.' The Rule of 70 does not diagnose the type of inflation. It simply relates the time horizon for prices to double given a rate of growth; diagnosing demand-pull versus cost-push requires analysis of underlying causes like demand shifts or supply shocks, not a doubling-time calculation. This makes A incorrect.
Option B: 'calculate the accompanying rate of unemployment.' There is no direct formula connecting the inflation rate to unemployment within the Rule of 70. The inflation rate tells you how fast prices rise, but it does not yield the unemployment rate by a simple rule. This reasoning renders B incorrect.
Option C: 'determine when the value of a real asset will approach zero.' The Rule of 70 estimates doubling time for a price level given a growth rate, not the time until a real asset fully loses value to zero. Real assets do not decay to zero in a predictable exponential sense via the Rule of 70, so this is not correct.
Option D: 'calculate the number of years required for the price level to double.' This is precisely what the Rule of 70 does: divide 70 by the inflation rate (in percent) to approximate the years for a price level to double. For example, at 7% inflation, about 70/7 = 10 years to double. This is the correct interpretation of the rule.
In summary, A, B, and C misapply the scope of the Rule of 70, while D correctly identifies its purpose and calculation. The question hinges on recognizing that the rule provides a doubling-time estimate for prices given a constant inflation rate, not diagnostic or unemployment or asset-zero timing information.

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