We propose a portfolio optimization approach to identifying private information. In our model, investors are exposed to liquidity and private information shocks and optimize their trading across stocks taking into account price impact (Kyle's Lambda). We obtain a very simple expression for a...

We investigate the effect of ambiguity about hedge fund investment strategies on asset prices and aggregate welfare. We model some traders (mutual funds) as facing ambiguity about the equilibrium trading strategies of other traders (hedge funds). This ambiguity limits the ability of mutual funds...

We analyze a model where different traders are informed of different fundamentals that affect the security value. We identify a source for strategic complementarities in trading and information acquisition: The aggressive trading on information about one fundamental reduces the uncertainty in...

We analyze a rational expectations equilibrium model to explore the implications of information networks for the financial market. When information is exogenous, social communication improves market efficiency. However, social communication crowds out information production due to traders'...

I investigate the impact of fundamental information acquisition costs on price informativeness and passive investing. Within a REE model of multiple risky assets and a redundant market index, I define passive investing as the optimal decision to: 1) free-ride on the information acquisition...

Behavioral biases like disposition effect and overconfidence have received much attention as a potential driver of numerous anomalies observed in the markets. Also, it has been argued that information uncertainty tends to exacerbate these biases and induce stronger irrational behavior among...

This paper studies information aggregation in financial markets with recurrent investor exit and entry. I consider a dynamic general equilibrium model of asset trading with private information and collateral constraints. Investors differ in their aversion to Knightian uncertainty: When...

If investors are differently informed about the payoff of market-traded securities, then the traditional market portfolio is not a relevant benchmark for testing the CAPM. Each investor appraises expected returns and builds his optimal portfolio conditionally on his information. Which proxy to...

We measure the profitability of an investment in voting stocks, considering the prices of both voting and non-voting stocks. As Niehoff (2016) showed, non-voting stocks' prices reflect new information on average faster than the prices of the corresponding voting stocks. To exploit this...