system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it good for the US economy that oil and other commodities be traded in dollars? Why do the US benefit from it?

Also, sorry if that "be" on the title is wrong, I suck at English :/
gpt
It creates demand for US dollars, as companies need to buy US dollars in order to buy oil as oil is traded in US dollars. The law of supply and demand says that increased demand gives rise to higher prices, so oil being traded in US dollars tends to keep the value of the US dollar higher, propping up its value, allowing US dollars to buy more good and services than would otherwise be possible.