For example, when a company in the United States sells goods to a company or distributor in China, does the U.S. company accept payment in yuan (which it then exchanges for dollars on the currency market) or dollars?
Likewise, when a Chinese company sells goods to an American company, does the Chinese company accept only yuan or will dollars suffice (even if they have to be sold to purchase yuan)?
Are some currencies (for example, the dollar, British pound, or euro) preferred in lieu of weaker currencies when two parties are exporting/importing on the international market?