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- 2022
- Working Paper
The Disappearing Index Effect
By: Robin Greenwood and Marco Sammon
The abnormal return associated with a stock being added to the S&P 500 has fallen from an average of 3.4% in the 1980s and 7.6% in the 1990s to 0.8% over the past decade. This has occurred despite a significant increase in the percentage of stock market assets linked...
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- 2022
- Working Paper
The Retail Habitat
By: Toomas Laarits and Marco Sammon
Retail investors trade hard-to-value stocks. Controlling for size, stocks with a high share of retail-initiated trades are composed of more intangible capital, have longer duration cash-flows and a higher likelihood of being mispriced. Consistent with retail-heavy...
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Keywords:
Retail;
Retail Trade;
Intangible Capital;
Mispricing;
Investment;
Valuation;
Business Earnings
- 2022
- Working Paper
Retail Investors’ Contrarian Behavior Around News, Attention, and the Momentum Effect
By: Cheng (Patrick) Luo, Enrichetta Ravina, Marco Sammon and Luis M. Viceira
Using a large panel of U.S. brokerage accounts trades and positions, we show that a large fraction of retail investors trade as contrarians after large earnings surprises, especially for loser stocks, and that such contrarian trading contributes to post earnings...
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- 2022
- Working Paper
Passive Ownership and Price Informativeness
By: Marco Sammon
I propose three new empirical measures of price informativeness motivated by a theoretical model. I find average price informativeness declined over the past 30 years and passive ownership is negatively correlated with price informativeness. To establish causality, I...
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Keywords:
Passive Ownership;
ETFs;
Market Efficiency;
Ownership;
Price;
Theory;
Measurement and Metrics
- 2022
- Working Paper
The Passive-Ownership Share Is Double What You Think It Is
By: Alex Chinco and Marco Sammon
We estimate that passive investors held 37.8% of the US stock market in 2020.
This value comes from studying the closing volumes of index additions and
deletions on reconstitution day. 37.8% is more than double the widely accepted
previous estimate of 15%, which...
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- 2022
- Working Paper
What Triggers National Stock Market Jumps?
By: Scott R. Baker, Nicholas Bloom, Steven J. Davis and Marco Sammon
We examine newspapers the day after major stock-market jumps to evaluate the proximate cause, geographic source, and clarity of these events from 1900 in the US, 1930 in the UK and 1980 in 12 other countries. We find four main results. First, the United States plays an...
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- December 2021
- Article
Trade Policy Uncertainty and Stock Returns
By: Marcelo Bianconi, Federico Esposito and Marco Sammon
A recent literature has documented large real effects of trade policy uncertainty (TPU) on trade, employment, and investment, but there is little evidence that investors are compensated for bearing such risk. To quantify the risk premium associated with TPU, we exploit...
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- 2022
- Working Paper
Customer Churn and Intangible Capital
By: Scott R. Baker, Brian Baugh and Marco Sammon
Intangible capital is a crucial and growing piece of firms’ capital structure and helps to explain long run trends in concentration and markups. We develop new firm level metrics regarding a key component of intangible capital—customer churn—using a class of household...
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- Article
The Unprecedented Stock Market Reaction to COVID-19
By: Scott Baker, Nicholas Bloom, Steven J. Davis, Kyle Kost, Marco Sammon and Tasaneeya Viratyosin
No previous infectious disease outbreak, including the Spanish Flu, has impacted the stock market as forcefully as the COVID-19 pandemic. In fact, previous pandemics left only mild traces on the U.S. stock market. We use text-based methods to develop these points with...
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- Article
Environmental, Social, and Governance Criteria: Why Investors Should Care
By: Ravi Jagannathan, Ashwin Ravikumar and Marco Sammon