The business or fee charged by a broker for arranging transactions between buyers and sellers, or archaic coins that are defective or misimpressed.
From Old French 'brocage,' meaning brokerage or mediation, derived from 'brocour' (broker). The numismatic sense emerged in the 16th century referring to defective coinage.
Medieval brokers were often people who broke open sealed wine casks to sell wine in smaller quantities—that's where 'broke' comes from, and their commission became 'brockage,' showing how commerce creates new words.
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