Trade
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.^{[1][need quotation to verify]} Barter involves trading things without the use of money.^[1] 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
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