So William Galston has an article in the New Republic questioning Keynes  and me. He lays great stress on the Reinhart-Rogoff claim that growth slows substantially when debt exceeds 90 percent of GDP.
First of all, thatÂs not in the Reinhart-Rogoff magnum opus. ItÂs in a later working paper, which is not nearly of the same standard.
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See the story and the embedded links to read a rebuttal that debt/GDP ~ 90% is doomful.
HTH.
Cheers,
Scott.