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Working Paper
Machine Learning and the Implementable Efficient Frontier
August 18, 2022
We propose that investment strategies should be evaluated based on their net-of-trading-cost return for each level of risk, which we term the "implementable efficient frontier." While numerous studies use machine learning return forecasts to generate portfolios, their agnosticism toward trading costs leads to excessive reliance on fleeting small-scale characteristics, resulting in poor net returns. We develop a framework that produces a superior frontier by integrating trading-cost-aware portfolio optimization with machine learning
Working Paper
Is There a Replication Crisis in Finance?
March 5, 2021
Several papers argue that financial economics faces a replication crisis because many studies cannot be replicated or are the result of multiple testing of too many factors. We develop and estimate a Bayesian model of factor replication that leads to different conclusions, including finding the majority of asset pricing factors can be replicated.
Working Paper
Game On: Social Networks and Markets
March 1, 2021
This paper studies how echo-chamber effects and fake news can lead to disagreement and misinformation with effects on investors’ portfolios and market prices. It presents a model how an investment idea can propagate through a social network, generating a trading frenzy with high turnover, a bubble in the price, and high price volatility. The paper also presents empirical evidence on the dramatic events related to the GameStop stock in January 2021 and discusses broader economic implications.
Working Paper
Does ESG Help or Hurt Returns?
December 7, 2020
Combining several large data sets, we compute the empirical ESG-efficient frontier and show the costs and benefits of responsible investing.
Data Set
Responsible Investing: The ESG-Efficient Frontier – Original Paper Data
October 29, 2020
This the original data set used in “Responsible Investing: The ESG-Efficient Frontier” (Pedersen, Fitzgibbons and Pomorski). It contains the total returns of the value-weighted and equal-weighted portfolios used in the paper.
Working Paper
Principal Portfolios
July 7, 2020
We propose a new asset-pricing framework in which all securities’ signals are used to predict each individual return. While the literature focuses on each security’s own- signal predictability, assuming an equal strength across securities, our framework is flexible and includes cross-predictability.
Journal Article
Enhanced Portfolio Optimization
Winner of the 2021 Graham and Dodd Top Award
March 2, 2020
We show how to identify the portfolios that cause problems in standard mean-variance optimization (MVO) and develop an enhanced portfolio optimization (EPO) method that addresses the problems. Applying EPO on several realistic datasets, we find significant gains relative to standard benchmarks.
Journal Article
Fact and Fiction About Low-Risk Investing
February 17, 2020
Low-risk investing has received a lot of attention over the past decade. An intensive academic debate has spurred, and been spurred by, the growing market for low-risk strategies. This article presents five fact and dispels five fictions about low-risk investing.
Working Paper
Responsible Investing: The ESG-Efficient Frontier
October 10, 2019
Combining several large data sets, we compute the empirical ESG-efficient frontier and show the costs and benefits of responsible investing.
Working Paper
Economics with Market Liquidity Risk
September 19, 2019
We discuss the effects of market liquidity risk on asset pricing, investment management, corporate finance, banking, financial crises, macroeconomics, monetary policy, fiscal policy, and other economic areas.