I get if you don't think the sales of the expensive stuff affects the related or identical cheap stuff.
But I'm completely convinced it's a factor in prices.
Consider a few sets.
T206 - easily the most common set of its era, maybe the most common prewar set. When I started, commons that were vg ish, were 1.50. First tier HOF $10. Cobb was more. Wagner was I think around 10K
Other sets from the same era? Despite being overall more difficult, often much ore difficult, the "easy" ones like E90-1 Sold for about the same.
Even later when T206 commons were around $10 E90-1s were maybe $15.
If there was no trickle down from the Wagner and slightly less from Plank, where would T206 commons be now.
I would say that being so easy, they would be less than 33 Goudey commons.
Similarly, I think 52 Topps owes most of its popularity to the Mantle. I don't think 52 Topps commons are tougher than say 53 Topps or 52 Bowman.
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