Monetarism is hard to define because it is not the doctrine of a school that is sharply differentiated from the rival Keynesian and new classical schools. While some ecconomists are clearly monetarists, others take intermediate positions that make it more or less arbitrary whether to call them...

Forward-looking RE models such as the popular New Keynesian (NK) model do not provide a unique prediction about how the model economy behaves. We need some mechanism that ensures determinacy. McCallum (2012) says it is not needed because models are learnable only with the determinate solution...