EDIT: Getting downvoted for no reason because people think I'm assuming everyone is US. No. There are other places in the world that uses "dollar" as a unit of currency. I live in Hong Kong, and we use Hong Kong Dollars (HKD), and our 2 dollar coins are flower-shaped.
If we take Everyone and remove any amount of people from it, that's not everyone but just some subset of everyone. That's the math at least.
Far from everyone uses US-Dollars. Here in Europe we use Euros creative name, I know) but there are manx many currencies around the world. Assuming everyone uses the US-Dolar is similar to assuming everyone is from the US.