Swedroe: Exploring The Profitability Factor

June 05, 2015

A June 2012 study authored by University of Rochester professor Robert Novy-Marx, “The Other Side of Value: The Gross Profitability Premium,” not only provided investors with new insights into the cross section of stocks returns, but also led to the development of new factor models that incorporate a profitability factor.


Novy-Marx’s Findings

Before unpacking a more recent paper with new insights into how accruals and cash flows can impact profitability, I think it’s important to summarize some of Novy-Marx’s more fundamental findings on this premium:


  • Profitability, as measured by gross profits-to-assets, has roughly the same power as book-to-market ratio (a value measure) in predicting the cross section of average returns.
  • Surprisingly, profitable firms generate significantly higher returns than unprofitable firms, despite having significantly higher valuation ratios (for instance, higher price-to-book ratios).
  • Profitable firms tend to be growth firms—they expand comparatively quickly. Gross profitability is a powerful predictor of future growth as well as of earnings, free cash flow and payouts.
  • The most profitable firms earn average returns 0.31 percent per month higher than the least profitable firms. The data is statistically significant, with a t-statistic of 2.49.
  • The abnormal return (alpha) of the profitable-minus-unprofitable return spread relative to the Fama-French three-factor model is 0.52 percent per month, with a t-statistic of 4.49.
  • The returns data is economically significant even among the largest, most liquid stocks.
  • Gross profitability has far more power in predicting the cross section of returns than earnings.
  • High asset turnover primarily drives the high average returns of profitable firms, while high gross margins are the distinguishing characteristic of “good growth” stocks.
  • Controlling for profitability dramatically raises the performance of value strategies, especially among the largest, most liquid stocks. Controlling for book-to-market improves the performance of profitability strategies.
  • While the more profitable growth firms tend to be larger than less profitable growth firms, the more profitable value firms tend to be smaller than less profitable value firms.
  • Strategies based on gross profitability generate valuelike average excess returns, even though they are actually growth strategies.
  • Because both gross profits-to-assets and book-to-market ratio are highly persistent, the turnover of the strategies is relatively low.
  • Strategies built on profitability are growth strategies, and so they provide an excellent hedge for value strategies. Adding profitability on top of a value strategy reduces the strategy’s overall volatility.



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