Question

sirf dollar hi world currency kyu hai or koi currency kyu nhi

Answer 1

A global currency is one that is accepted for trade throughout the world. Some of the world's currencies are accepted for most international transactions. The most popular are the U.S. dollar, the euro, and the yen. Another name for global currency is reserve currency.

Of these, the U.S. dollar is the most popular. It makes up 64 percent of all known central bank foreign exchange reserves. That makes it the de facto global currency, even though it doesn't hold an official global title.