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Working Paper

Game On: Social Networks and Markets

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

Principal Portfolios

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.

Working Paper

Trading Costs

Using live trade data from a large institutional money manager over a 19-year period, we find actual trading costs to be an order of magnitude smaller than previous studies suggest.

Perspective

High-Frequency Derangement Syndrome

Commentators are still blaming the wrong strategies for the recent market rout.

White Paper

Not Risk Parity Funds

The source of the recent market disruption may not be fully understood yet, but we can reveal what it wasn’t.

Perspective

Risk Parity Derangement Syndrome

Cliff Asness explains why risk parity and trend-following strategies are not to blame for the recent market volatility.

Perspective

You Can Have Your Momentum Factor and Eat it Too

Many investors are quick to dismiss momentum as too costly to implement because of its high turnover. After studying 7 years’ worth of live, real-world data across markets, we debunk that myth.

Perspective

The August of Our Discontent: Once More Unto the Breach?

Given the continued rise in popularity of factor investing, we recap the August 2007 “quant crisis”—those weeks when certain quant strategies suffered big losses—and its relevance for today.

Perspective

A Fanatic is One Who Can't Change his Mind and Won't Change the Subject¹

Ciff Asness critiques Rob Arnott’s strong viewpoints that rising valuations are responsible for the past performance of many factors and that their current valuation levels point to their impending doom.

Journal Article

Risk and Return of Equity Index Collar Strategies

Equity index collar strategies are often perceived as a way for investors, at little to no cost, to exchange some upside exposure for reduced losses on the downside.