Posted By:
Eric BrehmI too would very much like to know how PSA derives their SMR figures. It must be based to some degree on actual sales data, but I would like to know what algorithms they apply in deciding when to make an adjustment.
In the current SMR issue, the value of 1954 Bowman commons in NM-MT 8 has been adjusted downward from $55 to $45. That's the only change for that entire set. How the heck did they arrive at that?
Also, the value of 1933 Goudey #149 Babe Ruth in Mint 9 has been adjusted upward from $85,000 to $90,000. As far as I know, and according to the current PSA population report, this card does not exist in PSA 9. So what abstract concept did they apply, in deciding to increase the value of a card which does not in fact exist? Did they do a survey of card collectors and ask them what they would pay for it if it did?