Using the most basic analysis, when Supply and Demand both rise, the price should stay about the same.
I think we'd all agree that many more people buy things on ebay for xmas gifts than other times of year.
The question is: Do more sellers come to market to meet that demand? Prices definitely would drop if the number of sellers and items for sale remained the same, but the buyers increased.
Just all theory here- I havent really looked into any ebay stats
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