why USD is always first in the currencies lists?

Answer 1

Because the US Dollar is more widely held than any other currency in thr world. The people compilying the currency list know that a large number of people who check the list will only be interested in the Dollar, so they put it first.

Answer 2

This is the benchmark by which all other currencies are measured. One reason for this is the wealth of the US helps to keep it a stable currency over time. Also many countries "float" their currencies against the Dollar. They use monetary controls, like controls against inflation, based on the value of the Dollar in the markets. Some countries go so far as to "peg" their currencies to the dollar. If the value of a certain currency is say five "widgets" to the Dollar and the value of the Dollar goes down the the country would make its currency, in our example the widget, 6 widgets to the dollar, thereby devaluing its currency as well. Many countries in the world use the Dollar as the primary currency and openly circulate genuine US Dollars. In other countries black markets will circulate the Dollar illegally. Thanks hope this answers your question.

Answer 3

It is the currency the world runs on - us dollar.