Acts of giving and receiving something in return, or places where trading occurs. Can refer to conversations, financial markets, or any reciprocal transfer of goods or ideas.
From Old French 'eschangier', from Vulgar Latin 'excambiare' (to barter), from 'ex-' (out) + 'cambiare' (to change). The concept evolved from simple bartering to complex financial institutions where securities and commodities are traded.
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