While I'm a fan of Buffett, as he himself says macroeconomics isn't his speciality.
One issue with the story is he suggests the people selling America stuff, say China end up accumulating American land and owning the country but it's not what generally happens in practice. In practice foreigners tend to end up either with US dollar debt, which tends to inflate away, or equity in US companies, of which YCombinator and similar churn out hundreds of new ones each year.
Another thing is foreigners may end up buying some US real estate but the likes of Amazon ends up taking over much of the worlds retail industry as local shops close around the globe.
For reasons like this it's probably not worth worrying too much about the deficit and leaving it to market forces to figure out.
In much of the western US, especially Arizona, there are enormous farms growing water-intensive crops, in particular alfalfa. These farms are owned by assorted entities in the Middle East, and the crops are shipped overseas.
This is an enormous problem. The Colorado River basin is already over-allocated and there is not enough water to go around. But due to how water rights work, any entity can purchase an open-ended amount of our already endangered water supply and do as they please with it.
At this moment it isn't a critical problem, because we do have enough other agriculture and water to support ourselves. But with the direction the climate is heading, eventually we will have a drought of such severity that the water used by those farms makes or breaks us.
During the Great Famine in Ireland, the island consistently produced more than enough food to feed its citizens; it was all simply sent overseas.
One issue with the story is he suggests the people selling America stuff, say China end up accumulating American land and owning the country but it's not what generally happens in practice. In practice foreigners tend to end up either with US dollar debt, which tends to inflate away, or equity in US companies, of which YCombinator and similar churn out hundreds of new ones each year.
Another thing is foreigners may end up buying some US real estate but the likes of Amazon ends up taking over much of the worlds retail industry as local shops close around the globe.
For reasons like this it's probably not worth worrying too much about the deficit and leaving it to market forces to figure out.