​How Stock Markets are Like Baseball Cards

Wesley Gray |

I still have a Ken Griffey Jr. Rookie Card. To be honest, I don’t even know where the thing is, but I hope it is it worth a ton of money at this point (although I doubt it). So, disclaimer up front: I dabbled in baseball card trading back in the day. And for all of you out there who used to trade baseball cards, you’ll enjoy this recent research paper from Joey Engelberg, Linh Le, and Jared Williams. h.t. Quantpedia.

Stock Market Anomalies and Baseball Cards

We show that the market for baseball cards exhibits anomalies that are analogous to those that have been documented in financial markets, namely, momentum, price drift in the direction of past fundamental performance, and IPO under performance. Momentum profits are higher among active players than retired players, and among newer sets than older sets. Regarding IPO under performance, we find that newly issued rookie cards under perform newly issued cards of veteran players, and that newly issued sets under perform older sets. Our evidence is consistent with the predictions of Hong and Stein (1999) and Miller (1977).

Here are some key charts:

First, Rookie cards are like IPOs: They start out great…and eventually, then eventually fizzle out. (see Jay Ritter paper for background on IPO underperformance)



Second, momentum portfolios trading in baseball cards act a lot like momentum portfolios trading in stocks — but the momentum effect is way stronger!

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(Photo by Baseball Collection)

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