Market Liquidity as a Sentiment Indicator
Malcolm P. Baker
Harvard Business School; National Bureau of Economic Research (NBER)
Jeremy C. Stein
Harvard University - Department of Economics; National Bureau of Economic Research (NBER)
We build a model that helps to explain why increases in liquidity - such as lower bid-ask spreads, a lower price impact of trade, or higher turnover - predict lower subsequent returns in both firm-level and aggregate data. The model features a class of irrational investors, who underreact to the information contained in order flow, thereby boosting liquidity. In the presence of short-sales constraints, high liquidity is a symptom of the fact that the market is dominated by these irrational investors, and hence is overvalued. This theory can also explain how managers might successfully time the market for seasoned equity offerings, by simply following a rule of thumb that involves issuing when the SEO market is particularly liquid. Empirically, we find that: i) aggregate measures of equity issuance and share turnover are highly correlated; yet ii) in a multiple regression, both have incremental predictive power for future equal-weighted market returns.
Number of Pages in PDF File: 48
JEL Classification: G14, G32
Date posted: July 2, 2008 ; Last revised: January 13, 2009
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