Economics joke

A joke attributed to Robert Tollison

An economic historian is someone in a dark room looking for a black cat.

An economic theorist is someone in a dark room looking for a non-existent black cat.

An econometrician is someone in a dark room looking for a nonexistent black cat who finds it.

An economic methodologist, is someone in a dark room looking for economists so he can tell them how to search properly for black cats in dark rooms.