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Investing Research Articles

Is Irrational Exuberance Over Yet?

In the early 2001 update of their 1998 paper entitled “Valuation Ratios and the Long-Run Stock Market Outlook: An Update”, John Campbell and Robert Shiller focus on mean reversion of two valuation ratios, price-earnings and dividend-price, as key predictors of future stock market performance. The authors determine that mean reversions of these ratios occurs through stock price changes, not earnings or dividend changes. At the time of the update, they note that “these ratios imply a stronger case for a poor stock market outlook than has ever been seen before.” Keep Reading

Overview of Investor Herding

Investor herding is convergence of behavior based only on observation of what others are doing (such as buying or selling). Examples in the stock market are trend-following, “don’t fight the tape” and momentum investing. Herding is distinct from investors acting at the same time but independently in response to news related to investment fundamentals (such as the latest jobs report from the Bureau of Labor Statistics or a company earnings release). In their December 2001 paper entitled Herd Behavior and Cascading in Capital Markets: A Review and Synthesis, David Hirshleifer and Siew Hong Teoh provide an overview of financial herding. Keep Reading

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