From Longman Business Dictionarydual capacityˌdual caˈpacity noun [uncountable] FINANCE when a MARKETMAKER (=financial institution that has supplies of shares to sell) is allowed to buy and sell shares for itself as well as for clients. This situation has existed on the London stockmarket since BIG BANGUnder dual capacity a member firm can act as both agent and principal whereas previously jobbers and brokers were separated.
