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<p>[QUOTE=&quot;Conder101, post: 1848070, member: 66&quot;]I think the OP&#039;s scheme would work.......for widgets.&nbsp; Common always available in quantity average grade material.&nbsp; For anything else no.</p><p><br /></p><p>And Sheldon&#039;s &quot;equation&quot; wasn&#039;t completely linear either.&nbsp; It merely described the relationship between values and grades that existed at the time, and which had existed for some time.&nbsp; Where he went wrong was in not allowing for the fact that as the number of collectors increased and as they became more affluent, the demand would not increase evenly on all grades but would increase faster on the higher grades. So the nice neat original ratios would fall apart.[/QUOTE]</p><p><br /></p>

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