Information asymmetry and the ex ante impact of public disclosure quality on price efficiency and the cost of capital: Evidence from a laboratory market

This paper examines the ex ante effects of public information quality on market prices and how such effects vary with information asymmetry among traders in a two-period experimental market. We vary public information quality by changing its precision and information asymmetry among traders by varying the distribution of private signals. We find high-quality public disclosure leads to increased price efficiency and decreased cost of capital in the pre-announcement period when information asymmetry is high. The impending high-quality public information increases the competition among informed traders, which leads prices to impound more private information and alleviates the adverse selection problems facing uninformed traders. Our study suggests building a high-quality public information environment (e.g., by adopting high-quality accounting standards or committing to transparent disclosure policies) would likely provide ex ante benefits for firms with significant adverse selection among traders.