Trading Under Uncertainty About Other Market Participants

46 Pages Posted: 19 Dec 2019

Date Written: June 24, 2020


I present an asymmetric information model of financial markets that features rational, but uninformed, hedge fund managers who trade against informed and noise traders. Managers are uncertain not only about fundamentals, but also about the proportion of informed to noise traders in the market and use prices to update their beliefs about these uncertainties. Extreme news leads to an increase in both types of uncertainty, while it decreases price informativeness. Prices react asymmetrically to positive and negative news, with higher expected returns at times of increased uncertainty about market composition. The model generates a price-volume relationship that is consistent with established stylized facts. I then extend to a three-period model and study the dynamics of expected returns and volatility.

Keywords: Asymmetric information, Price informativeness, Noise traders

JEL Classification: G11, G12, G14

Suggested Citation

Papadimitriou, Dimitrios, Trading Under Uncertainty About Other Market Participants (June 24, 2020). Available at SSRN: or

Dimitrios Papadimitriou (Contact Author)

King's College London ( email )

Melbourne House
44-46 Aldwych
London, WC2B 4LL
United Kingdom

Do you have a job opening that you would like to promote on SSRN?

Paper statistics

Abstract Views
PlumX Metrics