alien invasion and the economy

"If we discovered that, you know, space aliens were planning to attack and we needed a massive buildup to counter the space alien threat and really inflation and budget deficits took secondary place to that, this slump would be over in 18 months. And then if we discovered, oops, we made a mistake, there aren't any aliens, we'd be better [off]." -- Paul Krugman, trotting out his own unique version of the Broken Window Fallacy