海角大神

My short answer is: 鈥渘o.鈥� Debt is a stock concept, not a flow one. To determine whether something is 鈥渟ustainable鈥� or not (whether it be the government鈥檚 fiscal condition, a family鈥檚 personal finances, environmental quality, one鈥檚 physical health, or even personal relationships) requires a look at the dynamics of the situation, not just a snapshot.

I mention this because there鈥檚 been a lot of buzz among fiscal policy economists over the past couple days, ever since the discussed the idea of setting a specific level of gross federal debt to GDP as a policy goal. Experts from all sides attacked this notion immediately, focusing on the 鈥済ross鈥� part. They emphasize that economically, it鈥檚 really net debt, or debt held by the public (investors whether American or foreign), that matters. of the (left-leaning) Center on Budget and Policy Priorities explains this very well, and of the (right-leaning) American Enterprise Institute agrees.

My objection is on the emphasis of a particular level of debt鈥搘hether gross or net, actually鈥揳s some sort of magical number that would trigger a particular set of bad economic outcomes if we were to reach it. Here, I think I agree with when he wraps up his complaint with (my emphasis added):

So what鈥檚 happening is that the idea that Really Bad Things happen when [gross] debt crosses 90 percent of GDP is being treated as a solid fact, when it鈥檚 nothing of the sort. And if the Obama commission feeds that false perception, right there it鈥檚 doing a lot of harm.

But鈥� I agree with Paul鈥檚 sentiment not because I think the debt (whether gross or net) is nothing to worry about, but because we should worry about it鈥搉ot for the particular level it鈥檚 at right now and not even for any particular level it may reach by some date in the future, but for the whole dynamic path we see it taking from here forward. In other words, roll the video; don鈥檛 just study the photo.

What makes the fiscal outlook unsustainable is not that there exists a debt (which is good thing to be able to carry by the way) and not even that the debt will be larger in the future (which also can be a good thing if it allows us to grow our income by even more in the future). What makes it unsustainable is that the moving picture of the debt shows it growing faster than our economy (our capacity to pay the costs of carrying that debt). And if you look around at the scenery in this video, you realize that there鈥檚 nothing yet visible on the stage or in the scene that will do anything to change that scary course we鈥檙e on.

I think it鈥檚 impossible to label any particular level of gross OR net debt to GDP as the 鈥渂reaking point鈥� for our economy. It鈥檚 easier to point to a particularly high particular level by a particular time鈥搒uch as net debt reaching 100% of GDP within the next ten years鈥揳s 鈥渨ell, yes, that鈥檚 certainly sufficiently unsustainable.鈥� I have said something like that often, but even then, not because debt (a stock) equaling 100% of GDP (a flow) means anything. Such a level of debt would be unsustainable for a number of factors, all of which are 鈥渕oving鈥� pieces that aren鈥檛 moving in the right directions. Our federal spending commitments via the entitlement programs are only increasing. Our investments in things that would grow the economy over the long term and preserve our resources for the long term seem to be shrinking. Our revenue base is at best stagnating鈥揷ertainly not keeping up with our needs. And our indebtedness is increasingly to foreign investors rather than to other fellow Americans.

These are all the moving pieces that make our fiscal situation unsustainable, and to point to a particular measure of debt as telling the story sells the story short and perpetuates the propaganda that fiscal hawks are just a bunch of 鈥渇earmongerers鈥� full of Chicken Little stories that are just a bunch of bull. The story of fiscal unsustainability is not a bunch of bull. You just need to watch the video to understand it.

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