Unit 13 agency Points for attention General agent: a general agent may be a firm or a person who acts under some degree of instructions from his principals to sell (or to buy) goods on the best terms obtainable. he charges a "commission? for his services under some kind of agreement or contractUnit 13 Agency Points for attention: General agent: A general agent may be a firm or a person who acts under some degree of instructions from his principals to sell (or to buy) goods on the best terms obtainable. He charges a “commission” for his services under some kind of agreement or contract