AGNOSTIC Papers

AgPa #37: Momentum Investing – Fact and Fiction

Fact, Fiction, and Momentum Investing (2014)
Clifford Asness, Andrea Frazzini, Ronen Israel, Tobias Moskowitz
The Journal of Portfolio Management Special 40th Anniversary Issue 2014, 40(5) 75-92, URL/AQR

After examining the general Facts and Fictions about factor investing, this week’s AGNOSTIC Paper examines momentum in more detail. Specifically, the authors combat 10 misleading myths about momentum…

  • Myth 1: Momentum returns are economically not meaningful
  • Myth 2: Long-only investors cannot capture momentum
  • Myth 3: Momentum is much stronger among small-caps
  • Myth 4: Momentum does not survive trading costs
  • Myth 5: Momentum produces a huge tax bill
  • Myth 6: Momentum is better as a screen than as a factor
  • Myth 7: Momentum returns should disappear in the future
  • Myth 8: Momentum is too volatile to rely on
  • Myth 9: Different momentum measures lead to different results
  • Myth 10: There is no theory behind momentum

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AgPa #36: Factor Investing – Fact and Fiction

Fact, Fiction, and Factor Investing (2023)
Michele Aghassi, Cliff Asness, Charles Fattouche, Tobias J. Moskowitz
The Journal of Portfolio Management Quantitative Special Issue 2023, URL

Whenever AQR writes about systematic investing, it’s (in my opinion) time to listen. This one is a very good overview about factor investing. Given that this is the intellectual basis of many things I do here on the website, it perfectly fits to the series.

  • Fiction: Factor investing is just data-mining
  • Fact: Factors are risky
  • Fiction: Factor diversification doesn’t work
  • Fact: Factors work in different market regimes
  • Fiction: Factors don’t work anymore
  • Fact: Factors were and are not crowded
  • Fiction: Everyone should (and can) invest in factors
  • Fact: Factor discipline beats factor timing
  • Fact: Sticking with factors is often difficult

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AgPa #35: Rethinking Active Management

Measuring skill in the mutual fund industry (2015)
Jonathan B. Berk, Jules H. van Binsbergen
Journal of Financial Economics 118(1), 1-20, URL/SSRN

From several of my earlier articles you may (correctly!) gained the impression that I am somewhat skeptical about the value-add of most (not all!) active fund managers. However, an excellent episode of the Rational Reminder Podcast featuring Jonathan Berk and Jules van Binsbergen convinced me of another perspective. This week’s AGNOSTIC Paper summarizes their work…

  • Alpha and outperformance alone do not measure skill
  • The average active manager added value – $3.2M per year
  • Investors identify and reward value-adding active managers
  • Active managers still overcharge – net alphas are negative

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AgPa #34: Inefficient Christmas Gifts

The Deadweight Loss of Christmas (1993)
Joel Waldfogel
The American Economic Review 83(5), 1328-1336, URL

Welcome to the Christmas edition! As a rare exception, this AGNOSTIC Paper is not about finance and investing. Instead, we will look at the economics of Christmas gifts…

  • Many non-cash gifts are economically inefficient
  • The deadweight loss of Christmas is in the billions

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AgPa #33: World Cups and Stock Markets

Sports Sentiment and Stock Returns (2007)
Alex Edmans, Diego García and Øyvind Norli
The Journal of Finance 62(4), 1967-1998, URL

Given that this week’s AGNOSTIC Paper coincides with the final of the World Cup, I couldn’t resist the temptation. Below you can see a chart of the knockout stage of this year’s tournament. But since you are visiting a nerdy finance website, the focus is not on the results, but on the post-match stock market returns of the playing countries…


You may (understandably) say that this is some nice storytelling but not much more. However, I didn’t made this up to create a story but the idea of this analysis actually comes from this week’s AGNOSTIC paper…

  • Stock markets of losing countries tend to underperform after important matches
  • The effect most likely comes from bad mood after sport losses

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AgPa #32: Agnostic Fundamental Analysis (3/3)

Boosting agnostic fundamental analysis: Using machine learning to identify mispricing in European stock markets (2022)
Matthias X.Hanauer, Marina Kononova, Marc Steffen Rapp
Finance Research Letters 48, URL/SSRN

The third and final post about agnostic fundamental analysis. This week’s AGNOSTIC Paper challenges the simple linear methodology and introduces vastly improved valuation models…

  • More sophisticated valuation models yielded better performance
  • Different models emphasize different fundamental variables

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AgPa #31: Agnostic Fundamental Analysis (2/3)

Global market inefficiencies (2021)
Söhnke M. Bartram, Mark Grinblatt
Journal of Financial Economics 139(1), 234-259, URL/SSRN

The second AGNOSTIC Paper on agnostic fundamental analysis. This one is the international out-of-sample test where the authors apply their methodology to stock markets around the world. The results point in the same direction and suggest robust out-of-sample evidence…

  • Undervalued stocks outperformed overvalued stocks – also globally
  • Agnostic fundamental analysis yielded significant alpha – globally and against up to 80 factors
  • Agnostic fundamental analysis remains profitable after transaction costs
  • The degree of market efficiency differs around the world

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AgPa #30: Agnostic Fundamental Analysis (1/3)

Agnostic fundamental analysis works (2018)
Söhnke M. Bartram, Mark Grinblatt
Journal of Financial Economics 128(1), 125-147, URL/SSRN

This week’s AGNOSTIC Paper tackles a very basic question: Does fundamental analysis work? For that purpose, the authors introduce an agnostic valuation model that explains the market capitalization of companies by their most recent fundamentals. A strategy that bets on the convergence of prices and estimated “fair” values generated strong profits between 1987 and 2012…

  • Undervalued stocks outperformed overvalued stocks by about 0.5% per month
  • Agnostic fundamental analysis yielded significant alpha

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AgPa #29: Cost-Mitigation Techniques

Comparing Cost-Mitigation Techniques (2019)
Robert Novy-Marx, Mihail Velikov
Financial Analysts Journal 75(1), 85-102, URL/SSRN

This week’s AGNOSTIC Paper examines three techniques to mitigate trading costs of systematic equity strategies and compares them by after-cost performance. The empirical evidence clearly speaks for the application of more sophisticated trading rules (Technique #3)…

  • Trading costs decreased but are still important
  • Technique #1: focus on “cheap-to-trade” securities
  • Technique #2: rebalance less frequently
  • Technique #3: create better trading rules
  • Value- versus equal-weighted portfolios

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AgPa #28: “Not Selling” of Insiders

Is “Not Trading” Informative? Evidence from Corporate Insiders’ Portfolios (2022)
Luke DeVault, Scott Cederburg, Kainan Wang
Financial Analysts Journal 78(1), 79-100, URL/SSRN

Transactions of insiders are usually a useful source of information when evaluating a stock. Insiders typically have a good understanding of the underlying business and buys are therefore often considered as positive signal. On the other hand, insider sales are not necessarily negative. There are many non-informative reasons to cash out. Maybe the insider needs some cash for personal expenditures or just wants to diversify his assets. This week’s AGNOSTIC Paper challenges this asymmetry and creatively shows that even those transactions convey important information…

  • “Not sold” stocks from insider portfolios outperformed
  • A portfolio of “not sold” stocks easily beat the US market
  • “Not sold” stocks with momentum are even better
  • Corporate insiders know more than institutional investors

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