A person who practices arbitrage; another term for an arbitrager or arbitrageur specializing in financial market price differentials.
From 'arbitrage' + '-ist' suffix meaning 'one who practices.' This variant emerged alongside arbitrageur and arbitrager as the field of arbitrage grew in the 19th-20th centuries.
Having three different words for the same job—arbitrager, arbitrageur, and arbitragist—shows how finance loves specialized vocabulary to make traders sound like wizards rather than just really attentive shoppers!
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