A person who specializes in or practices factoring, particularly a merchant factor or someone who breaks down numbers into factors.
From 'factor' plus '-ist' (a person who practices or specializes in something). A rare historical term for a merchant engaged in the factor trade.
A good factorist in colonial times needed to be a merchant, accountant, diplomat, and risk-taker all at once—they were gambling that distant ships would arrive safely and customers would pay. Many went broke; survivors became wealthy.
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