Papers In Preparation

Passive Ownership and the Stock Market (Updated 2/2019)

A copy of the paper can be found here (PDF)


Abstract: I document new stylized facts on a decrease in pre-earnings announcement price informativeness. Between 1990 and 2017, pre-earnings cumulative abnormal trading volume declined 10% and the pre-earnings drift declined 22%. Further, earnings days now account for 17% of total annual volatility, up from 3% in 1990. At the firm-level, increases in passive ownership can explain up to 76% of the decline in pre-earnings volume, 20% of the decline in the pre-earnings drift, and 14% of the increase in volatility on earnings days. These results are robust to using only quasi-exogenous variation in passive ownership that arises from S&P 500 index addition, and Russell 1000/2000 index reconstitution. One explanation for decreased efficiency is that passive managers lack strong incentives to gather and consume firm-specific information. Consistent with this mechanism, increases in passive ownership are correlated with fewer analysts covering a stock, decreased analyst accuracy, and fewer downloads of SEC filings.

Trade policy uncertainty and stock returns (Updated 7/2019)

Joint with Marcelo Bianconi and Federico Esposito

A copy of the paper can be found here (PDF)


This paper documents new stylized facts on the effects of trade policy uncertainty on stock returns. We exploit quasi-experimental variation in exposure to policy uncertainty arising from annual votes by Congress to revoke China’s NTR tariff rates between 1990 and 2001. Before China was permanently granted NTR rates, US manufacturing industries more exposed to trade policy uncertainty had stock returns 4.3% higher per year than less exposed sectors. Our results are not driven by stock prices’ responses to policy-related news, nor by the effect of Chinese competition on expected or realized returns. We argue instead that this difference in average returns is a risk premium for exposure to trade policy uncertainty. Moreover, we document that more exposed sectors had more volatile stock prices, and that indirect exposure to uncertainty through Input-Output linkages also commanded a risk premium.

What Triggers National Stock Market Jumps? (New Slides 8/2018)

Joint with Scott Baker, Nicholas Bloom and Steven Davis

The slides from SITE 2018 can be found here (PDF)

Main Findings: 1) 36% US jumps attributed to policy categories (and 41% internationally). Policy includes government spending, monetary policy and regulation. Non-policy includes macroeconomic news, corporate earnings & outlook and commodities. 2) Realized volatility is lower following policy-driven jumps, relative to non-policy jumps of the same magnitude and sign. We measure realized volatility as the sum of squared daily returns in the 22 trading days following the jump. 3) Outside the US, newspapers attribute 34% of jumps to US developments – above the US’s 11% share of global GDP. The share of jumps attributed to the US has been rising over time. 4) Volatility and trading volume are lower after jumps with high clarity. We define clarity as the first principal component of (1) agreement across newspapers describing the same jump (2) how confidently the journalist advanced their explanation (3) how easy it was to categorize the article (4) one minus the share of newspapers that did not give an explanation for the jump.

Pricing Dollar Strength Risk (Last Version 9/2017)

Joint with Marcelo Bianconi

A copy of the paper can be found here (PDF)

Abstract: The relative strength of the U.S. dollar does not explain the cross-section of expected returns. We find, however, that signed sensitivity of individual firms’ returns to moves in dollar strength matters for asset pricing. A portfolio that goes long high-dollar-sensitivity stocks and short low-dollar-sensitivity stocks earns a multi-factor alpha of 3%-7% per year. Sorting on dollar sensitivity captures firm fundamentals - in particular fraction of revenue from abroad. Dollar sensitivity has implications for profitability and fundamental momentum, as well as the relationship between momentum strategies across countries.

Published Papers

Environmental, Social, and Governance Criteria: Why Investors Are Paying Attention (Journal of Investment Management, January 2018)

Joint with Ravi Jagannathan and Ashwin Ravikumar

A copy of the paper can be found here (PDF)

Abstract: We find that money managers could reduce portfolio risk by incorporating Environmental, Social, and Governance (ESG) criteria into their investment process. ESG-related issues can cause sudden regulatory changes and shifts in consumer tastes, resulting in large asset price swings which leave investors limited time to react. By incorporating ESG criteria in their investment strategy, money managers can tilt their holdings towards firms which are well prepared to deal with these changes, thereby managing exposure to these rare but potentially large risks.

Implied Volatility and the Risk-Free Rate of Return in Options Markets (Published 1/2015)

Based on my Senior Honors Thesis at Tufts University.

A copy of the paper can be found here (PDF)

Abstract: We numerically solve systems of Black-Scholes formulas for implied volatility and implied risk-free rate of return. After using a seemingly unrelated regressions (SUR) model to obtain point estimates for implied volatility and implied risk-free rate, the options are re-priced using these parameters.

After repricing, the difference between the market price and model price is increasing in time to expiration, while the effect of moneyness and the bid-ask spread are ambiguous.

Our varying risk-free rate model yields Black- Scholes prices closer to market prices than the fixed risk-free rate model. In addition, our model is better for predicting future evolutions in model-free implied volatility as measured by the VIX.