"post-war Keynesians like Kaldor assumed that Say’s Law was now guaranteed by Keynesian full employment policy." #q Robert Skidelsky Wow. Mind blown. Yes, I concede once (genuine) full employment is reached, supply-side concerns over (dis-)incentives, skills shortages/mismatches, etc. _can_ be relevant. Until then, though, you're just twiddling the thermostat in the expectation that doing so will create the conditions that will spontaneously generate a roof for your house. http://www.skidelskyr.com/site/article/stylised-facts