Keynesians only: which brand of keynesianism do you prefer?

[buritobr]

There is not only one kind of keynesianism. There are four main keynesian tribes:

Neoclassical synthesis: accepts neoclassical theory for microeconomics and for long term growth, and uses the keynesian model Y=C+I+G for short term fluctuation. Considers that in the long term, the economy goes to the full employment equilibrium level, but since it takes time, some government policy is accepted. Considers that fiscal and monetary policies have short term effect on the output because there is some price rigidity. Most famous leaders: Paul Samuelson, James Tobin, Franco Modigliani, Robert Solow

New keynesianism: looks like the neoclassical synthesis, but the new keynesians accept the new classical theory of rational expectations and use microfundations in order to explain the short term price rigidities. Most famous leaders: Stanley Fisher, Olivier Blanchard, Joseph Stiglitz, Greg Mankiw, Jeffrey Sachs

Fundamentalist post keynesianism: these post keynesians are fundamentalist because they are worried about what Keynes really wanted to say. They consider that there is unemployment even if the prices and wages are flexible, because the investors hold money when there is uncertainty. They don't care too much about microeconomics, they accept Marshall microeconomics. Most famous leaders: Paul Davidson

Cambridge post keynesianism: the Cambridge post keynesians agree with the fundamentalists about the possibility of unemployment even if prices and wages are flexible, but they also research price rigidities using heterodox microeconomics, which include schumpeterians and marxists. Most famous leaders: Michal Kalecki, Nicholas Kaldor, Joan Robinson