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HankronI hate to get technical, but it would be a ranking of rarity not scarcity. Scarcity is a relative term (Something is scarce if demand substantially succeeds supply), while rarity is an absolute number and not related to demand ... If there is only one card and no one wants it, the card is rare but not scarce ... Due to demand (and as reflected in book value), a 1933 Goudey Babe Ruth is scarcer than a Ray Benge 1933 Goudey, even though Benge is most likely rarer.