About 90% of this phenomenon is attributed to supply and demand. If Addie Joss and Rube Waddell both lived to be 90 years old, they would be valued similarly to Sisler, Roush, etc.
The other 10% applies more to current players, and involves inflated value due to a player's popularity, for whatever reason (i.e. Jeter, Ichiro, Pujols, etc.).
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