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[sb1]

One thing in regard to using the back count as a basis of scarcity, is the unknown fact of exactly how many press runs were made of each back. You could have a very low back count with a lot of press runs or a high number or backs available with low runs of all. It's an unknown factor. This would account for some differences in perceived scarcity vs. backs.

[Wite3]

Scott said it better than I did about the print runs...

I also meant that the SPs could have replaced other players before print runs of different advertising...let's say that Adkins replaces Grant...Grant is printed with the Hassan 30, Cycle, and Piedmont while Adkins is then only printed with the Hassan 649 and Polar Bear runs. There is no way to know how many print passes were for each one but I can tell you that Grant is much harder than Adkins. To me, this means that the Adkins was printed on far more passes and that even though Grant appears on more advertising backs, he is certainly rarer than the Adkins.

Joshua