Socially Responsible Investing: The Eco-Efficiency Premium Puzzle
33 Pages Posted: 13 Feb 2004
Date Written: May 17, 2004
Abstract
There exists a widespread consensus among mainstream academics and investors that socially responsible investing (SRI) leads to inferior, rather than superior, portfolio performance. Using Innovest's well-established corporate eco-efficiency scores, we provide evidence to the contrary. We compose two equity portfolios that differ in eco-efficiency characteristics and find that our high-ranked portfolio provided substantially higher average returns compared to its low-ranked counterpart over the period 1995-2003. Using a wide range of performance attribution techniques to address common methodological concerns, we show that this performance differential cannot be explained by differences in market sensitivity, investment style, or industry-specific components. We finally investigate whether this eco-efficiency premium puzzle withstands the inclusion of transaction costs scenarios, and evaluate how excess returns can be earned in a practical setting via a best-in-class stock selection strategy. The results remain significant under all levels of transactions costs, thus suggesting that the incremental benefits of SRI can be substantial.
Note: Previously titled "Socially Responsible Investing: The Eco-Efficiency Premium in the U.S. Equity Market"
Keywords: Socially Responsible Investing, SRI, Corporate Environmental Performance, Eco-Efficiency, Performance Measurement, Style Analysis
JEL Classification: G12, G20, G23
Suggested Citation: Suggested Citation
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