GPAnlaysis Sold Prices
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I have made some purchases through some of the more common online comic shops and auction houses and have added the to GPA but those sale prices are not posted on GPA.  Do both the sell and buyer have to post the sale before they are posted on GPA?

 

 

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The seller reports it, however not all sellers/sites/auctioneers participate with GPA’s data collection program.  A list of those who do is on the GPA home page.  The buyer has no part in this. I don’t know what you think you did on GPA’s site, but it may simply have been recording it in your own personal collection.

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Generally you should read more on the actual website about what GPA does and how they collect their information, and from whom.  I would say it's fairly transparent.  With any other questions about how GPA does what they do, it would probably make more sense to contact them directly (not that you shouldn't ask here, I just don't know why you wouldn't rather get the information from them).

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