Don't get too excited by DeLong's interest in MMT. His latest post shows that he still hasn't read enough to realize that his objections have already been dealt with in many places. So he remains a deficit dove, calling for austerity "later." In addition, it's pretty clear that he doesn't have deep knowledge of monetary economics and is stuck in "old thinking." Disappointing.
Grasping Reality with Both Invisible Hands
Is There Still A Demand For Even More Modern Monetary Theory Weblogging?
J. Bradford DeLong | Professor of Economics, UCAL Berkeley
(h/t y in the comments)
My comment over there:
MMT economists have addressed fiscal sustainability in many places, blog posts papers, books, and even a conference. Two that come to mind are Bill Mitchell's blog post, "The full employment budget deficit condition," and Scott Fullwiler's paper, "Interest Rates and Fiscal Sustainability." To understand the stock flow consistent macro modeling that MMT uses, see Wynne Godley and Marc Lavoie, Monetary Economics (Plagrave MacMillan, 2nd ed., 2012). Now that MMT is gaining purchase, maybe it's time to dig into the lit instead of shooting from the hip?
For Robert Waldmann, see Edward Harrison, "MMT for Austrians" at Credit Writedowns.
For Weimar, see Hyperinflation in Weimar Germany: New Perspective on the “German View” using a Post-Keynesian Flow of Funds Framework" by Joseph LalibertĂ© at Fictional Reserve Banking; L. Randall Wray, "Zimbabwe! Weimar Republic! How Modern Money Theory Replies to Hyperinflation Hyperventilators (Part 1)," and Edward Harrison, "MMT: Fear of Hyperinflation" at Naked Capitalism, also posted as "Hyperinflation in the USA" at Credit Writedowns. Hyperinflation - It's More than Just a Monetary Phenomenon by Cullen O. Roche shows that historically hyperinflations have been caused exogenously.
Basically, the terms imposed on Germany at the end of WWI resulted in the need to obtain gold or foreign currency in international markets for reparations, which resulted in currency depreciation. This resulted in domestic inflation, which was exacerbated by curtailed supply resulting from the hobbling of Germany's productive capacity due to the terms of settlement. This lead to the Weimar hyperinflation, which Keynes decried in The Economic Consequences of the Peace. "The inflationism of the currency systems of Europe has proceeded to extraordinary lengths. The various belligerent Governments, unable, or too timid or too short-sighted to secure from loans or taxes the resources they required, have printed notes for the balance." Weimar was clearly a special case that is unrelated to conditions in the US.