Matias Vernengo has a nice summary of it here:
Matias Vernengo, “A Debate on Endogenous Money and Effective Demand: Keen, Fiebiger, Lavoie and Palley,” Naked Keynesianism, July 25, 2014.Two of the papers are also available for download:
Keen, Steve. 2014. “Endogenous Money and Effective Demand,” Review of Keynesian Economics 2.3: 271–291Matias Vernengo makes the point that Schumpeter’s contributions to economics are overrated: for example, his view of trade cycles is basically like the real business cycle theory.
Lavoie, Marc. 2014. “A Comment on ‘Endogenous Money and Effective Demand’: A Revolution or a Step Backwards?,” Review of Keynesian Economics 2.3: 321–332.