I think I remember seeing some sort of index for the top 20 modern football cards somewhere (sportscollectorsdaily.com, I believe). It would be interesting to see if there is any correlation between the stock market (or other market indexes/indicators) and the sports card markets. Anything done would need some sort of selection, whether it's the football card index or something else, but whatever the result, it would be very interesting.
Wish I had the math skills to figure it all out!
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