The reason why you need the dollar is because of the balance of payments identity: changes to the capital account + current account = 0
So to run a current account surplus against the rest of the world of $100, you need to accumulate $100 of financial claims belonging to the rest of the world. There are complexities, for example I switched from "trade surplus" to "current account" because things like interest payments also need to be added in, but with these adjustments, you cannot run prolonged trade surpluses without storing your money in some other nation's jurisdiction.
Now the question is, which nation is willing to accomodate inflows of a trillion dollars a year? That's right, only a single nation is willing to do that. Most nations ban or severely restrict foreign capital inflows. Those that don't ban it, they don't have the necessary financial infrastructure to accomadate the scale of surpluses that China needs to run. This is why I laugh at all these reports of "China is dumping treasuries". China accumulated over a trillion dollars of dollar claims over the last year. That's in addition to what they already had. Why? Because who else would allow those levels of foreign capital inflows into their economy.
So once again, the US is the only nation willing and able to absorb these capital inflows.
Personally, I don't think this is sustainable, it's deindustrializing the US and is highly destabilizing, but since the liberalization of global capital flows launched by the Clinton administration, we have been doing this 30 year experiment in what happens when you let countries print money and use them to buy your bonds. The results have been, in my opinion, highly destabilizing, and it's not going to end well. But many of those who grew up in this period, think this is just how the world works and they can't imagine any other system, one in which capital inflows were highly restricted and as a result, no nation ran large trade surpluses against any other. Or they don't think about this at all and believe that China's hard work and industrial prowess is why they are able to run large trade surpluses, completely ignoring the whole money printing to buy US bonds that is happening in the background. When the US was the world's primary industrial power in the period 1870 - 1920, we ran current account deficits, not surpluses. What China is doing, industrializing while exporting capital -- that is truly unprecedented and possible only due to the combination of fiat non-convertible money combined with the US allowing unrestricted capital inflows. It's a truly bizarre state of affairs.
So to run a current account surplus against the rest of the world of $100, you need to accumulate $100 of financial claims belonging to the rest of the world. There are complexities, for example I switched from "trade surplus" to "current account" because things like interest payments also need to be added in, but with these adjustments, you cannot run prolonged trade surpluses without storing your money in some other nation's jurisdiction.
Now the question is, which nation is willing to accomodate inflows of a trillion dollars a year? That's right, only a single nation is willing to do that. Most nations ban or severely restrict foreign capital inflows. Those that don't ban it, they don't have the necessary financial infrastructure to accomadate the scale of surpluses that China needs to run. This is why I laugh at all these reports of "China is dumping treasuries". China accumulated over a trillion dollars of dollar claims over the last year. That's in addition to what they already had. Why? Because who else would allow those levels of foreign capital inflows into their economy.
So once again, the US is the only nation willing and able to absorb these capital inflows.
Personally, I don't think this is sustainable, it's deindustrializing the US and is highly destabilizing, but since the liberalization of global capital flows launched by the Clinton administration, we have been doing this 30 year experiment in what happens when you let countries print money and use them to buy your bonds. The results have been, in my opinion, highly destabilizing, and it's not going to end well. But many of those who grew up in this period, think this is just how the world works and they can't imagine any other system, one in which capital inflows were highly restricted and as a result, no nation ran large trade surpluses against any other. Or they don't think about this at all and believe that China's hard work and industrial prowess is why they are able to run large trade surpluses, completely ignoring the whole money printing to buy US bonds that is happening in the background. When the US was the world's primary industrial power in the period 1870 - 1920, we ran current account deficits, not surpluses. What China is doing, industrializing while exporting capital -- that is truly unprecedented and possible only due to the combination of fiat non-convertible money combined with the US allowing unrestricted capital inflows. It's a truly bizarre state of affairs.