Analyzing Economic Patterns Across Time

An economist observes that in a particular country during the 19th century, a 1% decrease in the unemployment rate was consistently associated with a 0.5% increase in the rate of inflation over several decades. However, in the late 20th century, this relationship broke down and became unpredictable. What is the most likely explanation for the initial stability of this trade-off?

Comparing Economic Responses to a Supply Shock

The observed trade-off between the rate of inflation and the unemployment rate has been a consistently unstable and shifting relationship throughout all historical economic periods.