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Message:: [QUOTE="GDJMSP, post: 3233724, member: 112"]Randy think of them like this. Just about everybody knows that the values for coins listed in the Red Book are worse than worthless and nowhere near reality. But, what the values in the Red Book can do for you is give a rough idea of which coin in a given series is worth more than other coins in the same given series. For example, let's say you're talking about a scarce date/mint Morgan, if you use the Red Book you won't have any idea of its true value, but you will know it is worth more than most of the other Morgans. Same kinda thing with the TPG pop reports. That said, if you have access to the printed versions of the pop reports, those can be invaluable for determining how and when the TPGs change their grading standards, and how often. This is because the printed versions don't change, while the online versions change on a daily basis. This historical record allows you to see major changes in populations on a month by month, quarterly, or yearly basis. And that information can be key to determining value. But back to your primary question. I only know of one actual study being done on the very question you asked. And it was published in the numismatic press. And it occurred back in the early 2000's if memory serves. The conclusion of the study, at that time, was that the pop reports were skewed by resubmissions about 20%. In other words the numbers were 20% higher than they would have been had there been no resubmissions. But, that was back then, which was near or before the TPGs began radically changing their grading standards. If such a study were done today, my guess would be that the result would show that resubmissions account for somewhere in the neighborhood of 50-60% of pop reports. But that number is for the total of all submissions. And with the understanding that populations of graded coins has more than doubled in the same time period. Of course it must also be understood that you'd have to break coins into two classes - classic coins and modern coins. This is because the submission numbers of modern coins grew exponentially over the time period involved, quickly accounting for half or more of the total number of submissions. Prior to that time period submissions of moderns were a tiny fraction of total submissions. But, classic coins exist in basically a finite number - there are only so many of them out there. And if you were to consider resubmissions for only classic coins, I suspect that number would almost certainly jump to somewhere around 80%. In other words approximately 80% of all classic coins have been resubmitted and regraded, and with a substantial number of them upgraded since the early 2000's. So, pop reports can tell you a lot, provided you have access to historical records. But much of it is not what most most people want to hear.[/QUOTE]

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