Although this blog post considers some very technical material its message is simple. Mainstream macroeconomic models that are used to determine policy choices by governments are deeply flawed and the evidence strongly supports a central thrust of Modern Monetary Theory (MMT) – that fiscal policy is powerful and that austerity will kill growth. In that sense, it helps us understand why various nations and blocs (such as the Eurozone) struggled after the onset of the GFC. It also explains why the deliberate attack on Greek prosperity by the Troika was so successful in demolishing any prospect of growth – an outcome that the official dogma resolutely denied as they constructed one vicious bailout after another. It also explains why New Keynesian approaches to macroeconomics are flawed and should be ignored. I was reminded this week by a research paper I had read last year (thanks Adam for the reminder) which presents a devastating critique (though muted in central bank speak) of the mainstream approach to macroeconomic modelling. A research paper from the ECB (May 2017, No 2058) – On the sources of business cycles: implications for DSGE models – provides a categorical critique of DSGE models and a range of other stunts that mainstream economists have tried to introduce to get away from the obvious – economic cycles are demand driven.