Another one for the SABR Baseball Cards blog, obviously motivated by the recent Moser/PSA/PWCC scandals.

SABR's Baseball Cards Research Committee

By now you are probably at least somewhat familiar with the various scandals rocking the baseball card world. Any summary I could provide here would be outdated by the time I hit “Publish.” Therefore I will address only one aspect of the scandal, one that to some collectors is no scandal at all: the alteration, restoration, and repairing on cards. (Also see “What Do Baseball Cards Want?” for a related SABR Baseball Cards article.)

I will lead off with an unquestioned assumption I think most collectors have hung their hats on for a while: condition is a one-way street.

True or not, we at least initially presume cards begin in some pristine (or at least best) state from which their condition either stays the same or gets worse over time. Were we to plot the condition of a card continuously over time, we could get what your calculus…

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