Baseball cards exhibit 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 underperformance. Momentum profits are higher among active players than retired players, and among newer sets than older sets. Not only does this mean you shouldn’t have all of your eggs in one basket, like the stock market, but it also means that hybrid investmen ts like trading cards are ideal. Not only are cards nostalgic and emotionally relevant, like fine art, but they’re also data-driven securities like stocks. In my research, I found that baseball cards act exactly like shares of stock. When a card company (Topps, for example) would print a particular player’s rookie card, they released shares of that