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While debt-to-GDP ratios already have a limited but very misunderstood use, it seems economists are finding bright new ways of misunderstanding them. Now we say that when nominal interest rates are lower than nominal growth rates, the

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downward pressure on the debt-to-GDP ratio makes rising government debt and larger government deficits more sustainable and more easily justified.

This is totally confused. When the nominal interest rate is lower than the nominal GDP growth rate, it only means that net...

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borrowers are getting a disproportionate share of growth relative to net lenders. This in and of itself changes the comparability of the debt-to-GDP ratio, so the fact that the ratio may decline tells us nothing about its sustainability which, I'm glad to say, isn't...

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a mistake Olivier Blanchard makes in this article.

At least three things matter. First, whether or not rising debt is sustainable depends almost wholly on underlying conditions in the real economy, and only trivially on the arithmetical relationship between...

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the interest rate and the growth rate. Second, this approach simply assumes away financial distress costs, in which case debt capacity is infinite anyway and the interest rate becomes irrelevant. And third, it assumes that the nominal debt level matters independently...