A new communique from the man who saw it all coming, warning us to prepare for Weimar II. If ever you wanted an illustration of just how inexact a “science” economics is, watch this clip back to back with The One’s assurances last night (at roughly 4:20 here) that the stimulus is the only way to avoid Armageddon. How much good has 75 years of data done us? From the NYT’s front-pager this morning on Japan’s experiment, this much: Economists tend to divide into two camps on the question of Japan’s infrastructure spending: those, many of them Americans like Mr....