“Instead, I would concede her a point of uncertain importance. There isn't really a great deal to economics, considered as a logical structure based upon a few indisputable axioms about the world. … A logician is a wondrous creature, but he cannot distinguish between the two simple errors: if A = B, and B = C, then (1) A = 1.01C, and (2) A = 10⁶⁵C. An economist can.”