Has Diff in Diff Lowered the Price on Synth?

Magic, Pegasuses, Weights, Imputation, and maybe what’s changed

Boy was this fun to write. I’ve had this thing in my drafts for a month, and in my brain for two years. Sort of went on a rant about magic and spells, so reader beware.

A well known result in microeconomics is that when the relative price of one good increases, ignoring income effects, people substitute to some nearby substitute. Watching econometricia…