One of the more confusing of the macroeconomic debate is the emergence of a profusion of schools of thought with very similar names, but very different viewpoints. The one I’ve had most to deal with is Modern Monetary Theory. I had a go at this topic here and . My brief summary is that MMT pretty much coincides with traditional Keynesian views in the context of a liquidity trap, but that I reject the claim commonly made in popular presentations of MMT, that increased government spending doesn’t imply increased taxation.
Then there’s New Monetarism, associated with Stephen Williamson. He and I had a set-to a while back, which entertained many but didn’t produce a lot of enlightenment, and left me disinclined to put a lot of effort into understanding the differences between New and Old Monetarism. (For the record, I’m pretty much an Old Keynesian, but I have learnt a fair bit from New Keynesians like Akerlof and Shiller).
The third entrant is “Market Monetarism” associated mainly with Scott Sumner (though Wikipedia tells me the term was coined by Lars Christensen). I was aware in general terms that Sumner advocated a more expansionary monetary policy in response to the current crisis (I agree), that he prefers Nominal GDP level targeting to inflation targeting as the basis for monetary policy (I agree again though I’d prefer targeting levels rather than growth rates) and that he thinks this would be sufficient to fix the problem without any role for fiscal policy (I disagree). However, I wasn’t really aware that these ideas formed the basis of a school of thought, and I still haven’t investigated the underlying theory in any detail.
Sumner has commented on my recent posts on fiscal and monetary policy with a couple of his own, so I guess it’s time for me to look more closely at what he is saying. A first response is over the fold.