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This paper estimates a Behavioral New Keynesian model to revisit the evidence that passive US monetary policy in the pre-1979 sample led to indeterminate equilibria and sunspot-driven fluctuations, while active policy after 1982, by satisfying the Taylor principle, was instrumental in restoring macroeconomic stability. The model assumes "cognitive discounting", i.e., consumers and firms pay less attention to variables further into the future. We estimate the model allowing for both determinacy and indeterminacy. The empirical results show that determinacy is preferred both before and after 1979. Even if monetary policy is found to react only mildly to inflation pre-Volcker, the substantial degrees of bounded rationality that we estimate prevent the economy from falling into indeterminacy.

This paper estimates a New Keynesian model with new and old behavioral elements. Agents in the model exhibit cognitive discounting, or myopia: they discount variables far into the future at higher rates than typically implied in the benchmark model. We investigate the model under different expectational assumptions: rational expectations, subjective expectations with infinite-horizon learning, and subjective expectations with Euler-equation learning.Under rational expectations, the model necessitates of large, possibly unrealistically so, degrees of myopia. The same result persists under infinite-horizon learning, given that agents are still remarkably far-sighted. But, under Euler-equation learning, the model can fit the data with only minimal estimated degrees of myopia. The results indicate that the empirical evidence for cognitive discounting may be sensitive to the modeling of expectations, and they highlight learning as a key behavioral feature to understand macroeconomic fluctuations.

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