History suggests that extreme run-ups in the cyclically adjusted price-earnings ratio are a signal that the stock market may be overvalued. A simple regression model using a small set of macroeconomic explanatory variables can account for most of the run-up in the CAPE ratio since 2009, offering some justification for its current elevated level. The model predicts a modest decline in the ratio over the next decade. All else being equal, such a decline would imply lower stock returns relative to those in recent years when the ratio was rising.
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