Publications

08 May 2020
News

Why the Unemnployment Rate is 15 Percent. Here's Why the Stock Market Doesn't Mind.

February 2018 (Revised October 2019)
Case

Steinhoff International and the Stock Exchange

By: Siko Sikochi and Austin Lim

Nicky Newton-King, the Chief Executive Officer of the Johannesburg Stock Exchange (JSE), was put in a difficult position. A scandal had broken out at Steinhoff, a JSE-listed company, under her watch and there were calls to suspend listing of the company securities from... View Details

Keywords: Accounting; Financial Reporting; Mergers and Acquisitions; Financial Markets; Corporate Governance; Retail Industry; Manufacturing Industry; Distribution Industry; Africa; South Africa

Educators

Purchase

2025
Working Paper

Government-Brokerage Analysts and Market Stabilization: Evidence from China

By: Sheng Cao, Xianjie He, Charles C.Y. Wang and Huifang Yin

We show analysts at government-controlled brokerage firms serve as a market stabilization tool in China. Using earnings forecasts from 2005–2019, we find government-brokerage analysts issue relatively more optimistic—yet less accurate and timely—forecasts during... View Details

Keywords: Sell-side Analysts; Forecast Optimism; Forecast Accuracy; Government Incentives; Market Stabilization; Government Ownership; Coordinated Economies; Stocks; Forecasting and Prediction; Business and Government Relations; Emerging Markets

20 Mar 2012
Working Paper Summaries

The Stock Selection and Performance of Buy-Side Analysts

Keywords: by Boris Groysberg, Paul Healy, George Serafeim, Devin Shanthikumar & Gui Yang; Financial Services

May 2014
Article

Information and Two-Sided Platform Profits

By: Andrei Hagiu and Hanna Halaburda

We study the effect of different levels of information on two-sided platform profits under monopoly and competition. One side (developers) is always informed about all prices and therefore forms responsive expectations. In contrast, we allow the other side (users) to... View Details

Keywords: Responsive Expectations; Passive Expectations; Wary Expectations; Information; Performance Expectations; Two-Sided Platforms; Monopoly

spring 2008
Article

Cost Reductions, Cost Padding and Stock Market Prices: The Chilean Experience with Price Cap Regulation

By: Rafael Di Tella and Alexander Dyck

Keywords: Cost; Price; Stocks; Markets; Governing Rules, Regulations, and Reforms; Chile

Research Summary

Analyst Disagreement, Forecast Bias and Stock Returns

We present evidence of inefficient information processing in equity markets by documenting that biases in analysts' earnings forecasts are reflected in stock prices. In particular, investors fail to account for analysts' tendency to withhold negative views and to issue... View Details

September – October 2007
Article

Trading Patterns and Excess Comovement of Stock Returns

By: Robin Greenwood and Nathan Sosner

n April 2000, 30 stocks were replaced in the Nikkei 225 Index. The unusually broad index redefinition allowed for a study of the effects of index-linked trading on the excess comovement of stock returns. A large increase occurred in the correlation of trading volume of... View Details

Keywords: Stocks; Investment Return; Market Transactions; Mathematical Methods

September 2023
Article

Stock Price Reactions to ESG News: The Role of ESG Ratings and Disagreement

By: George Serafeim and Aaron Yoon

We investigate whether ESG ratings predict future ESG news and the associated market reactions. We find that the consensus rating predicts future news, but its predictive ability diminishes for firms with large disagreement between raters. Relation between news and... View Details

2024
Working Paper

What Drives Variation in Investor Portfolios? Estimating the Roles of Beliefs and Risk Preferences

By: Mark Egan, Alexander MacKay and Hanbin Yang

We present an empirical model of portfolio choice that allows for the nonparametric estimation of investors' (subjective) expectations and risk preferences. Utilizing a comprehensive dataset of 401(k) plans from 2009 through 2019, we explore heterogeneity in asset... View Details

Keywords: Stock Market Expectations; Demand Estimation; Retirement Planning; Defined Contribution Retirement Plan; 401 (K); Finance; Investment Portfolio; Investment; Retirement; Behavioral Finance; Financial Services Industry; United States

09 Jun 2020
Working Paper Summaries

Aggregate and Firm-Level Stock Returns During Pandemics, in Real Time

Keywords: by Laura Alfaro, Anusha Chari, Andrew Greenland, and Peter K. Schott

2021
Working Paper

Going by the Book: Valuation Ratios and Stock Returns

By: Ki-Soon Choi, Eric So and Charles C.Y. Wang

We study the use of firms’ book-to-market ratios (B/M) in value investing and its implications for comovements in firms’ stock returns and trading volumes. We show B/M has become increasingly detached from common alternative valuation ratios over time while also... View Details

Keywords: Valuation Ratios; Book-to-market Ratios; Investment Return; Investment; Decision Making

Article

Entry into Platform-based Markets

By: Feng Zhu and Marco Iansiti

This paper examines the relative importance of platform quality, indirect network effects, and consumer expectations on the success of entrants in platform-based markets. We develop a theoretical model and find that an entrant's success depends on the strength of... View Details

Keywords: Platform-based Markets; Winnter-take-all; First-mover Advantage; Indirect Network Effects; Video Game Industry; Quality; Network Effects; Market Entry and Exit; Digital Platforms; Motion Pictures and Video Industry

March 2020
Technical Note

Influencer Marketing

By: Jill Avery and Ayelet Israeli

Despite a heavy barrage of advertising, most consumers declare that their purchases are most influenced by the experiences, advice, and recommendations of others, and not by marketers. Interpersonal communication between and among consumers serves as a potent path for... View Details

Keywords: Influencers; Marketing; Marketing Communications; Brands and Branding; Marketing Strategy; Media and Broadcasting Industry; Advertising Industry; Consumer Products Industry

Educators

Purchase

21 Oct 2022
Research & Ideas

People Trust Business, But Expect CEOs to Drive Social Change

Public trust in business remains relatively unshaken amid economic turbulence and a lingering pandemic, even as faith in the media and government falters, but leaders could do more to address social issues, a new global opinion survey shows. However, not everyone... View Details

Keywords: by Scott Van Voorhis

2002
Working Paper

Cost Reductions, Cost Padding and Stock Market Prices: The Chilean Experience with Price Cap Regulation

By: Rafael Di Tella and Alexander Dyck

11 Jun 2013
Working Paper Summaries

Measurement Errors of Expected Returns Proxies and the Implied Cost of Capital

Keywords: by Charles C.Y. Wang

August 2007 (Revised June 2020)
Case

Trouble with a Bubble

By: Tom Nicholas

Examines technology, firm performance, and the stock market during the 1929 Great Crash and the Great Depression of the 1930s. The 1920s was an extraordinary period of technological progress marked by a strong run-up in stock market prices. Firms invested heavily in... View Details

Keywords: Bubble; Stock Market; Great Depression; Irving Fisher; Information Technology; Organizational Change and Adaptation; History; Financial Markets; Performance; Labor and Management Relations; Equity; Financial Crisis; Innovation and Invention; United States