A person who engages in arbitrage, buying securities or commodities in one market and selling them in another to profit from price differences.
From French 'arbitrage' + '-er' suffix. The word emerged in 18th-century financial markets as sophisticated trading strategies developed among merchants and bankers.
Arbitragers are financial ninjas—they exploit tiny price differences that most people never notice, buying gold in London for $1,999 and selling it in New York for $2,001, pocketing the difference before you blink!
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