NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Paul Woolley

Financial Markets Group
London School of Economics
London WC2A 2AE
UNITED KINGDOM

E-Mail: EmailAddress: hidden: you can email any NBER-related person as first underscore last at nber dot org
Institutional Affiliation: London School of Economics

NBER Working Papers and Publications

September 2014Asset Management Contracts and Equilibrium Prices
with Andrea M. Buffa, Dimitri Vayanos: w20480
We derive equilibrium asset prices when fund managers deviate from benchmark indices to exploit noise-trader induced distortions but fund investors constrain these deviations. Because constraints force managers to buy assets that they underweight when these assets appreciate, overvalued assets have high volatility, and the risk-return relationship becomes inverted. Noise traders bias prices upward because constraints make it harder for managers to underweight overvalued assets, which have high volatility, than to overweight undervalued ones. We endogenize the constraints based on investors' uncertainty about managers' skill, and show that asset-pricing implications can be significant even for moderate numbers of unskilled managers.
December 2008An Institutional Theory of Momentum and Reversal
with Dimitri Vayanos: w14523
We propose a rational theory of momentum and reversal based on delegated portfolio management. An investor can hold assets through an index or an active fund. Investing in the active fund involves a time-varying cost, interpreted as managerial perk or ability. The investor responds to an increase in the cost by flowing out of the active and into the index fund. While prices of assets held by the active fund drop in anticipation of these outflows, the drop is expected to continue, leading to momentum. Because outflows push prices below fundamental values, expected returns eventually rise, leading to reversal. Besides momentum and reversal, fund flows generate comovement, lead-lag effects and amplification, with all effects being larger for assets with high idiosyncratic risk. The active-fun...

Published: Dimitri Vayanos & Paul Woolley, 2013. "An Institutional Theory of Momentum and Reversal," Review of Financial Studies, Society for Financial Studies, vol. 26(5), pages 1087-1145. citation courtesy of

 
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