by Aaron S. Yoon - Publications - Faculty & Research

February 2024 (Revised February 2024)
Case

CLSA: Integrating ESG in Stock Valuation

By: Shirley Lu, Aaron Yoon and Billy Chan

In 2023, a senior financial analyst at the Hong Kong-based stock brokerage firm CLSA was surprised to see that, based on his calculations, the financial impact from climate risks on a major Indian cement manufacturing company’s projected earnings could be massive.... View Details

Keywords: Accounting; Corporate Governance; Analysis; Stocks; Valuation; Environmental Sustainability; Financial Services Industry; Industrial Products Industry; Hong Kong; China; India; Asia

Citation

Educators

January 2024
Article

Cost of Exempting Sole Orphan Drugs from Medicare Negotiation

By: Matthew Vogel, Olivia Zhao, William B. Feldman, Amitabh Chandra, Aaron S. Kesselheim and Benjamin N. Rome

Importance: The Inflation Reduction Act (IRA) requires Medicare to negotiate prices for some high-spending drugs but exempts drugs approved solely for the treatment of a single rare disease.
Objective: To estimate Medicare spending and global... View Details

Keywords: Health Care and Treatment; Insurance; Price; Health Industry

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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

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SSRN

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2022
Working Paper

The Evolution of ESG Reports and the Role of Voluntary Standards

By: Ethan Rouen, Kunal Sachdeva and Aaron Yoon

We examine the evolution of ESG reports of S&P 500 firms from 2010 to 2021. The percentage of firms releasing these voluntary disclosures increased from 35% to 86% during this period, although the length of these documents experienced more modest growth. Using a... View Details

Keywords: Voluntary Disclosure; Textual Analysis; Modeling And Analysis; Corporate Social Responsibility and Impact; AI and Machine Learning; Accounting

Citation

SSRN

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2022
Article

Which Corporate ESG News Does the Market React To?

By: George Serafeim and Aaron Yoon

Using a dataset that classifies firm-level ESG news as positive and negative, we examine how stock prices react to different types of ESG news. We analyze 111,020 firm-day observations for 3,126 companies and find that prices react only to issues identified as... View Details

Keywords: ESG; ESG (Environmental, Social, Governance) Performance; ESG Ratings; Social Capital; Environment; Sustainability; CSR; Stock Price; Stock Market Expectations; Materiality; Market Reaction; Environmental Sustainability; Governance; Social Issues; Performance; News

Citation

SSRN

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November 2016
Article

Corporate Sustainability: First Evidence on Materiality

By: Mozaffar Khan, George Serafeim and Aaron Yoon

Using newly available materiality classifications of sustainability topics, we develop a novel dataset by hand-mapping sustainability investments classified as material for each industry into firm-specific sustainability ratings. This allows us to present new evidence... View Details