Whats Wrong With Functional Finance? Wonkish
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Debt can’t go to infinity – it can’t exceed total wealth.

Potential useful Krugman quote on incentives and debt growth
"...What about debt? A lot depends on whether the interest rate is higher or lower than the economy’s sustainable growth rate. If rg you do have the possibility of a debt snowball: the higher the ratio of debt to GDP the faster, other things equal, that ratio will grow. And debt can’t go to infinity - it can’t exceed total wealth, and in fact as debt gets ever higher people will demand ever-increasing returns to hold it. So at some point the government would be forced to run large enough primary (non-interest) surpluses to limit debt growth.........assumes that the government always can and will run these surpluses as needed. He dismisses any concern about the incentive effects of high tax rates; certainly Very Serious People grossly exaggerate these effects, but they’re not completely imaginary.And he says nothing at all about the political difficulty of achieving the required surpluses, yet such difficulties seem likely to be central if debt gets to very high levels. A numerical example may help make the point. Imagine that one way or another we get up to debt equal to 300 percent of GDP, and that r-g =.015 - the interest rate is 1.5 percentage points above the growth rate. Then stabilizing the ratio of debt to GDP would require a primary surplus equal to 4.5 percent of GDP. That’s not impossible: Britain ran surpluses that big for several decades after Waterloo. But it’s a lot to ask of a modern polity. Are we going to slash Medicare and Social Security? Are we going to impose a value-added tax, not to finance new programs, but simply to service the debt? It’s possible, but you do have to wonder whether the temptation to engage in some form of financial repression/debt restructuring/inflation would prevail. And more to the point, investors would wonder about that, pushing r-g even higher...."
Paul Krugman, "What’s Wrong With Functional Finance? (Wonkish),"New York Times, February 12, 2019, https://www.nytimes.com/2019/02/12/opinion/whats-wrong-with-functional-finance-wonkish.html


