NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Simple Forecasts and Paradigm Shifts

Harrison Hong, Jeremy C. Stein

NBER Working Paper No. 10013
Issued in October 2003
NBER Program(s):   AP

We study the implications of learning in an environment where the true model of the world is a multivariate one, but where agents update only over the class of simple univariate models. If a particular simple model does a poor job of forecasting over a period of time, it is eventually discarded in favor of an alternative yet equally simple model that would have done better over the same period. This theory makes several distinctive predictions, which, for concreteness, we develop in a stock-market setting. For example, starting with symmetric and homoskedastic fundamentals, the theory yields forecastable variation in the size of the value/glamour differential, in volatility, and in the skewness of returns. Some of these features mirror familiar accounts of stock-price bubbles.

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Document Object Identifier (DOI): 10.3386/w10013

Published: Hong, Harrison, Jeremy C. Stein and Jialin Yu. “Simple Forecasts and Paradigm Shifts." Journal of Finance 62 (2007): 1207-1242.

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