From John Mauldin in his blog, Mauldin Economics, Where is the Growth?
Our lives and our conversations are full of presuppositions. Our daily lives are based upon quite fixed views of how the world really works. Often, the answers we come to are logically predictable because of the assumptions we make prior to asking the questions. If you allow me to dictate the presuppositions for a debate, then there is a good chance I will win the debate.
The presupposition in much of academic economics is that the Keynesian, and in particular the neo-Keynesian, view of economics is how the world actually works. There has been an almost total academic capture of the bureaucracy and mechanism of the Federal Reserve and central banks around the world by this neo-Keynesian theory.
What happens when one starts with the twin presuppositions that the economy can be described correctly using a multivariable dynamic equilibrium model built up on neo-Keynesian principles and research founded on those principles? You end up with the monetary policy we have today. And what Larry Summers calls secular stagnation.