We analyze the equilibrium spread when the transaction size of informed traders is elastic in the value of private information (α). We show that the pooling equilibrium is likely to be inefficient when trade size is sensitive to α and the inefficient equilibrium can occur before the market...

Market efficiency varies across individual stock according to stock attributes. This paper finds prices are closer to random walk benchmarks for stocks with better liquidity provision, frequent trading, greater return volatility, higher prices, larger market capitalizations, and smaller trade...