By |Published On: October 6th, 2014|Categories: Research Insights, Value Investing Research|

Earnings Yields, Market Values, and Stock Returns

Core Idea:

At this time, there was significant dispute in academia as to whether the value premium was perhaps due to the size effect.

The paper attempts to disentangle the anomaly of earnings to price ratio (or “P/E”) from that of firm size; it examines the relation between the stock returns and E/P and size effects, using a longer sample (from 1951 to 1986) than previous research and investigating January and non-January months separately.

Alpha Highlight:

  • The core finding is that size is primarily a seasonal effect, and thus that the E/P effect was not fundamentally driven by size.
  • Note below how the coefficients on both E/P and size are significant in January, but only the E/P coefficient was significant outside of January. 
2014-10-03 18_00_42-0Value Reseach Recap.pptx - Microsoft PowerPoint (Product Activation Failed)


The results are hypothetical results and are NOT an indicator of future results and do NOT represent returns that any investor actually attained. Indexes are unmanaged, do not reflect management or trading fees, and one cannot invest directly in an index. Additional information regarding the construction of these results is available upon request.

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About the Author: Wesley Gray, PhD

Wesley Gray, PhD
After serving as a Captain in the United States Marine Corps, Dr. Gray earned an MBA and a PhD in finance from the University of Chicago where he studied under Nobel Prize Winner Eugene Fama. Next, Wes took an academic job in his wife’s hometown of Philadelphia and worked as a finance professor at Drexel University. Dr. Gray’s interest in bridging the research gap between academia and industry led him to found Alpha Architect, an asset management firm dedicated to an impact mission of empowering investors through education. He is a contributor to multiple industry publications and regularly speaks to professional investor groups across the country. Wes has published multiple academic papers and four books, including Embedded (Naval Institute Press, 2009), Quantitative Value (Wiley, 2012), DIY Financial Advisor (Wiley, 2015), and Quantitative Momentum (Wiley, 2016). Dr. Gray currently resides in Palmas Del Mar Puerto Rico with his wife and three children. He recently finished the Leadville 100 ultramarathon race and promises to make better life decisions in the future.

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Important Disclosures

For informational and educational purposes only and should not be construed as specific investment, accounting, legal, or tax advice. Certain information is deemed to be reliable, but its accuracy and completeness cannot be guaranteed. Third party information may become outdated or otherwise superseded without notice.  Neither the Securities and Exchange Commission (SEC) nor any other federal or state agency has approved, determined the accuracy, or confirmed the adequacy of this article.

The views and opinions expressed herein are those of the author and do not necessarily reflect the views of Alpha Architect, its affiliates or its employees. Our full disclosures are available here. Definitions of common statistics used in our analysis are available here (towards the bottom).

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