The Equity Risk Premium

What this book actually teaches

The Equity Risk Premium: Essays and Explorations (2006), edited by William N. Goetzmann and Roger G. Ibbotson, is a collected volume published by Oxford University Press that compiles foundational and influential papers on the equity risk premium — the return premium investors have historically earned from equities over the risk-free rate. Goetzmann and Ibbotson frame the collection as both a historical archive and an active intellectual debate: the equity risk premium is not a settled fact but an ongoing question about what the historical data actually means and what it implies about expected future returns.

The volume is organized thematically rather than chronologically. The opening sections cover the empirical record — the measurement of realized equity returns across markets and time periods, the methodology challenges in constructing long historical series, and the landmark Ibbotson-Sinquefield data work that established the foundation for modern equity premium estimates. Later sections address the theoretical debate: the Mehra-Prescott equity premium puzzle (why the historical premium is so large relative to what asset pricing theory predicts), the various proposed resolutions, and the forward-looking debate about whether the historical premium overstates what investors can reasonably expect going forward.

Several of the included essays address the forward-looking equity premium directly — a practical question for anyone building a financial plan or evaluating pension fund return assumptions. The debate between historically-grounded estimates (using long-run realized returns as the anchor) and supply-side estimates (using dividend growth and earnings growth as the building blocks) is represented in both directions. Robert Arnott and Peter Bernstein's influential 2002 paper arguing that the forward-looking premium may be near zero is included alongside responses, giving readers access to both sides of one of the most consequential debates in applied finance.

The international evidence sections are an important supplement to the U.S.-centric literature that dominates most discussions. Papers examining equity returns in European and global markets complicate the picture: U.S. returns over the twentieth century were exceptional compared to most other markets, and the survivorship bias this creates in estimates based purely on U.S. data is a recurring theme across several contributions.

The limitation is the format: this is an edited academic collection, not a narrative text. Readers who need to synthesize the core arguments will need to bring analytical judgment to the material — the essays sometimes assume background knowledge of asset pricing theory and empirical methods. The 2006 publication date also predates the 2008 financial crisis and the subsequent decade of low yields, both of which generated additional research on the equity premium in an environment quite different from the one the historical data describes.

For practitioners in institutional investment, pension fund management, financial planning, or academic finance who need to engage seriously with where the equity risk premium comes from, what the historical record says, and what range of forward-looking estimates the evidence supports, this collection provides the primary sources in one place.

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About William N Goetzmann

Read more from William N Goetzmann and explore the full bibliography on ClearValue Books.