Machine Learning
The Virtue of Complexity in Return Prediction
March 1, 2024
Contrary to conventional wisdom, we theoretically prove that simple models severely understate return predictability compared to “complex” models in which the number of parameters exceeds the number of observations. We empirically document the virtue of complexity in U.S. equity market return prediction. Our findings establish the rationale for modeling expected returns through machine learning.
Factor/Style Investing
Fact, Fiction, and Factor Investing: Practical Applications
September 1, 2023
This piece distills the central concepts and practical takeaways of our Fact, Fiction, and Factor Investing article, which examined many claims about factor investing, referencing an extensive academic literature and performing simple, yet powerful, analysis to address those claims.
Tax Aware
Beyond Direct Indexing: Dynamic Direct Long-Short Investing
May 3, 2023
On average, net losses realized by direct indexing loss-harvesting strategies taper off within the first few years after their inception, and these strategies also exhibit a high dispersion of net loss outcomes. We show that long-short strategies motivated by factor investing can significantly outperform direct indexing strategies from both a pre-tax and tax perspective.
Equities
International Diversification—Still Not Crazy after All These Years
May 3, 2023
International diversification has hurt US-based investors for over 30 years, but the long-run case for it remains relevant. We show that both financial theory and common sense favor international diversification, buttressed by empirical supportive evidence. Additionally we show it would be dangerous to extrapolate the post-1990 outperformance of US equities.
Asset Allocation
Investing in Interesting Times
January 31, 2023
Given 2022’s cheapening of asset valuations, some have questioned if we are still in a world of low expected returns. We review what’s changed after 2022, showing that the lower expected return picture has not been substantially altered for many asset classes. We provide some suggestions to potentially ameliorate the pain caused by this environment.
Factor/Style Investing
Fact, Fiction, and Factor Investing
December 22, 2022
Factor investing has been around for several decades, backed by an enormous body of literature, and yet it is still surrounded by much confusion and debate. We examine many of the claims about factor investing, referencing the academic literature and performing simple, yet powerful, analysis to address them.
ESG Investing
ESG Ratings: A Compass without Direction
August 2, 2022
We examine the recent concerns about the reliability of the assessments of ESG ratings providers. We review the demand for ESG information, the stated objectives of ESG ratings providers, how ratings are determined, the evidence of what they achieve, and structural aspects of the industry that potentially influence ratings. We find that while ESG ratings providers may convey important insights into the nonfinancial impact of companies, significant shortcomings exist in their objectives, methodologies, and incentives which detract from the informativeness of their assessments.
Portfolio Construction
A Changing Stock-Bond Correlation
Q1 2023
For the past two decades, the stock/bond correlation – a fundamental detriment of risk in traditional portfolios – has been consistently negative. However, this hasn’t always been the case, and a positive stock/bond correlation could reappear due to macroeconomic changes. In this article, we assess the broad implications this would have for investors and set out practical steps to prepare for such an outcome.
ESG Investing
Supply Chain Climate Exposure
May 1, 2022
To manage climate risks, investors need reliable climate exposure metrics, but such risks may be difficult to measure, particularly along the supply chain. Using broadly accessible data, we propose an intuitive metric that quantifies the exposure a company has to customers and suppliers. Our metric is related to scope 3 emissions and captures the strength of economic linkages as well as the overall climate exposure of a firm’s customers and suppliers.
Tax Aware
Taxes, Charity, and Hedge Funds: Tax Implications of Charitable Contributions of Leveraged Partnership Interests
January 10, 2022
As a result of recent Treasury regulations, investors in investment partnerships, such as hedge funds, might end up recognizing capital gains when they contribute their partnership interests to a charity. We explain how such taxable gains upon charitable contributions arise and quantify how punitive they might be.