Debt and Delusion

NEW HAVEN – Economists like to talk about thresholds that, if crossed, spell trouble. Usually there is an element of truth in what they say. But the public often overreacts to such talk.

Consider, for example, the debt-to-GDP ratio, much in the news nowadays in Europe and the United States. It is sometimes said, almost in the same breath, that Greece’s debt equals 153% of its annual GDP, and that Greece is insolvent. Couple these statements with recent television footage of Greeks rioting in the street. Now, what does that look like?

Here in the US, it might seem like an image of our future, as public debt comes perilously close to 100% of annual GDP and continues to rise. But maybe this image is just a bit too vivid in our imaginations. Could it be that people think that a country becomes insolvent when its debt exceeds 100% of GDP?

That would clearly be nonsense. After all, debt (which is measured in currency units) and GDP (which is measured in currency units per unit of time) yields a ratio in units of pure time. There is nothing special about using a year as that unit. A year is the time that it takes for the earth to orbit the sun, which, except for seasonal industries like agriculture, has no particular economic significance.

We should remember this from high school science: always pay attention to units of measurement. Get the units wrong and you are totally befuddled.

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Economic View: A Way to Share in a Nation’s Growth

By ROBERT J. SHILLER in the NY Times:

CORPORATIONS raise money by issuing both debt and equity, the latter giving investors an implicit share in future profits. Governments should do something like this, too, and not just rely on debt.

Borrowing a concept from corporate finance, governments could sell a new type of security that commits them to paying shares in national “profit,” as measured by gross domestic product.

Historically, one impediment to such a move was the difficulty in accounting on a national scale: governments didn’t even try to measure G.D.P. until well into the 20th century.

Although G.D.P. numbers still aren’t perfect — they are subject to periodic revisions, for example — the basic problem has been largely solved. So why not issue shares in G.D.P. now?

Such securities might help assuage doubts that governments can sustain the deficit spending required to keep sagging economies stimulated and protected from the threat of a truly serious recession. In a recent pair of papers, my Canadian colleague Mark Kamstra at York University and I have proposed a solution. We’d like our countries to issue securities that we call “trills,” short for trillionths.

Read the full commentary

The Case for Trills by Mark Kamstra and Robert Shiller

Abstract: "We make the case for the U.S. government to issue a new security with a coupon tied to the United States’ current dollar GDP. This security might pay, for example, a coupon of one-trillionth of the GDP, and we propose the name "Trill" be used to refer to this new security. This new debt instrument should be of great interest to the Government for its stabilizing influence on the budget (as coupon payments fall in a recession with declining tax revenues) and for its yield, based on our valuation. Standard asset pricing analysis also suggests that Trills would enable important new portfolio diversification strategies and, in contrast to available assets that protect relative standards of living in retirement, Trills would have virtually no counterparty risk. We believe there would be a lively appetite for the Trill from institutional investors, public and private pension funds, as well as the individual investor. "

Read the full paper [pdf]

Read Noam Scheiber's take at the Stash blog