There never was a 90% cliff. And most of the downward slope in teh scatter came not from debt accumulation but from growth that had been slow for other reasons. See Owen Zidar (2013): Debt to GDP & Future Economic Growth:
Hoisted from the Archives: Risks of Debt: The Real Flaw in Reinhart-Rogoff: 2013: A country that spends and spends and spends and spends and does not tax sufficiently will eventually run into debt-generated trouble. Its nominal interest rates will rise as bondholders fear inflation. Its business leaders will hunker down and try to move their wealth out of the corporations they run for fear of high future taxes on business. Real interest rates will rise because of policy uncertainty, and make many investments that are truly socially productive unprofitable. When inflation takes hold, the web of the division of labor will shrink from a global web he'd together by thin monetary ties to a very small web solidified by social bonds of trust and obligation—and a small division of labor means low productivity. All of this is bound to happen. Eventually. If a government spends and spends and spends but does not tax sufficiently.
But can this happen as long as interest rates remain low? As long as stock prices remain buoyant? As long as inflation remains subdued. My faction of economists—including Larry Summers, Laura Tyson, Paul Krugman, and many many others—believe that it will not...
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