Trade

To trade is to willingly give things or services and get other things or services in return. For example, a person giving a thing must find another person who wants to get that thing. The giver gets something back in return. A trade is sometimes also called an "exchange" or a "swap".

An early type of trade is barter. Barter was the exchange of goods and services for other goods and services. Barter involves trading things without using of money. Modern traders commonly buy and sell by the use of money. Trade between two traders is called bilateral trade. Trade between more than two traders is called multilateral trade.