Investopedia explains 'Adaptive Expectations Hypothesis'
For example, if inflation over the last 10 years has been running in the 2-3% range, investors would use an inflation expectation of that range when making investment decisions. Consequently, if a temporary extreme fluctuation in inflation occurred recently, such as a cost-push inflation phenomenon, investors will overestimate the movement of inflation rates in the future. The opposite would occur in a demand-pull inflationary environment.
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