He writes,
Adding all the offbalance-sheet liabilities together, I calculate total federal off-balance-sheet commitments came to $70.1 T as of 2012, or about 6 times the size of the on-balance-sheet debt. In other words, the budget impact associated with an aging population and other challenges could turn out to have much more significant fiscal consequences than even the mountain of on-balance-sheet debt already accumulated.
When Hamilton presented this paper a several weeks ago at Cato, Bob Hall and I had exactly the same reaction. The off-balance-sheet liabilities are contingent liabilities. They often take the form of out-of-the-money options. Think of the Pension Benefit Guaranty Corporation. In some states of the world, it will lose a lot of money, and in other states it will break even or make a profit. To report just one number seems uninformative. The same holds for the government’s portfolio and guarantees of mortgages and mortgage-backed securities. The problem cries out for scenario analysis, in which you present possible values for the key drivers (such as interest rates) and possible outcomes (for, say, the ten-year budget outlook).
This led to a testy exchange between me and Douglas Holtz-Eakin, who insisted that Congress wants a single number. It so happened that a couple of weeks ago I was scheduled to give an informal talk at the Congressional Budget Office (which Holtz-Eakin once headed) on a topic of my choice. I chose the topic of scenario analysis.
I said that for the purpose of my talk, we would assume that you could talk to Congress like adults. That is, anyone in a position of responsibility at a large financial corporation could understand scenario analysis. If our elected representatives, who oversee trillions of dollars, cannot handle it, then we have some really big problems. (I think, in fact, that this is the case. As an aside, I would love to have someone who thinks government is not too big explain to me why he is not bothered by the fact that you cannot have an adult conversation with the people who are in charge of it.)
So, assuming that you would not be thrown out of the room for engaging in scenario analysis, the question becomes how one should do it. I thought that the more outspoken people at CBO were a bit defensive. They said that in the case of macroeconomic forecasting, for example, they had white papers that considered many scenarios and that they reported a range of possibilities based on those scenarios. My reply was that this was not a particularly helpful way to communicate scenario analysis–it just creates a sort of smeared picture. Instead, for example, I suggested that in textbook macro terms you could look at the effect of fiscal stimulus under a scenario in which the Fed holds interest rates constant, a scenario in which the Fed uses a Taylor rule, and a scenario under which the Fed targets nominal GDP. Showing those three scenarios probably would be educational.
Returning to off-balance sheet liabilities, key drivers include interest rates, demographics, and the impact of medical technology and practice. I am particularly interested in seeing the effects of interest rates, because I suspect that a rise in interest rates would adversely affect the budget outlook for many of these off-balance-sheet items.