(So, I wrote nearly this whole post before completely undermining it at the very end. But I didn't really feel like throwing it away, so even if I'm basically an idiot here, at least it could bring about some discussion. But keep in mind that, somewhat ironically, I no longer stand by some of what I've written here.)
With the economy tanking one of those comments you hear from time-to-time is that China, whose holdings of US debts amount to $585 billion, or over 4% of our entire economy, will suddenly call in our debt, crushing our economy.
Is this scenario plausible? Might China actually do this? I can't say it more strongly:
no.
Unless I'm missing something, I can base this conclusion on
two three things. For one, "China" is not one entity. There's about 1.5 billion people there right? Now sure, the debt is likely to be pretty consolidated among more powerful actors, but it's not like there's one guy in the government who sits in front of two buttons all day that say "hold" and "call," just waiting for the moment to trash the economy. So for "China" to call in our debt, that would mean that some circumstance would have to change that would result in the many different Chinese debtholders simulateneously wanting to call in that debt.
OK, I'm going to kind of gloss over number two because I did not follow this in my intermediate macro class, but I'm pretty sure this issue of debt is tied into trade deficits. So for China to call in the debt would mean that China would also not be able to continue selling us more than we sell them. And I don't think they want to do that. (If anyone can correct me on this one, please do)
But the third one is also pretty key. Let me add here that Japan holds almost the same amount of debt that China does, and combined they hold about 9% of our debt, or $1.15 trillion. So, I was going to assume that the treasury rate was about 4% returns on this debt. Unfortuantely, I just looked it up and realized it's closer to 0.4%. This really kills my argument, but I'll keep going anyway. So, 4% of $1.15 trillion means a return of $46 billion per year on this investment. By contrast - think about how much fuss there was over the $25 billion for the automakers. Even at today's rate of 0.46%, this results in annual interest of $5.29 billion. And that's not a bad take. OK, you're right it kind of is. Dammit.