"Trade involves the transfer of goods or services from one person or entity to another, often in exchange for money. Economists refer to a system or network that allows trade as a market.
An early form of trade, barter, saw the direct exchange of goods and services for other goods and services.[need quotation to verify] Barter involves trading things without the use of money. When either bartering party started to involve precious metals, these gained symbolic as well as practical importance.[citation needed] Modern traders generally negotiate through a medium of exchange, such as money. As a result, buying can be separated from selling, or earning. The invention of money (and later of credit, paper money and non-physical money) greatly simplified and promoted trade. Trade between two traders is called bilateral trade, while trade involving more than two traders is called multilateral trade." - (en.wikipedia.org 01.03.2020)
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