What made currency better than barter for international trade?

Hey is money better than barter system in trade}? The main advantage of money over barter is that money is always going to be usable. Barter is very often not possible. This is because of the need for what is called a “coincidence of wants” (sometimes called a “double coincidence of wants”).

the main reason that the constitution did not proclaim all men to be free and equal is because of the issue of slavery.