We derive an equilibrium price that converges to be strong-form informationally efficient in the original Grossman-Stiglitz model (1980). Specifically, we show that when the private signal converges to be perfect or traders converge to be risk neutral, there exists a unique overall equilibrium...

This study investigates how exchange-traded fund (ETF) activity affects the informational efficiency of its underlying stocks in the Chinese market which has several different features from developed markets. We show that increased ETF ownership improves stock liquidity and attracts informed...