>>"But eventually the economists prevailed. More coupons were issued, couples became more willing to go out, opportunities to baby-sit multiplied, and everyone was happy. Eventually, of course, the co-op issued too much scrip, leading to different problems ..."<<
Of course, these different problems are just ignored. Krugman never seems to want to discuss whether these new problems, entirely caused by centralized control, are worse than the problem the "alert management" intended to solve in the first place.
It's what makes his oft-use example so excellent. Here you had, presumably, a small group of highly-educated and, presumably, reasonably intelligent folks who couldn't even manage an economy with 150 homogenous players. And yet, we expect much better results when we introduce billions of players and millions of additional variables.