[[Trade]] is the voluntary exchange of [[good (accounting)|goods]], [[Service (economics)|service]]s, or both, and a form of [[economics]]. A mechanism that allows trade is called a [[market]]. The original form of trade was [[barter (economics)|barter]], the direct exchange of goods and services. Modern traders instead 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 [[Credit (finance)|credit]], paper money and non-physical money) greatly simplified and promoted trade. | [[Trade]] is the voluntary exchange of [[good (accounting)|goods]], [[Service (economics)|service]]s, or both, and a form of [[economics]]. A mechanism that allows trade is called a [[market]]. The original form of trade was [[barter (economics)|barter]], the direct exchange of goods and services. Modern traders instead 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 [[Credit (finance)|credit]], paper money and non-physical money) greatly simplified and promoted trade. |