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Short for Arbitrageurs..
A trader who practices arbitrage. That is, an arbitrageur attempts to profit from inefficiencies in price by making transactions that offset each other. For example, one may buy a security at a low price, and, within a few seconds, re-sell it to a willing buyer at a higher price. Arbitrageurs can keep prices relatively stable as markets attempt to resist their attempts at price exploitation. They often use computer programs because their transactions can be complex and occur in rapid succession.