A. As to manner of creation
1. Express agent has been actually authorized by the principal, either orally or in writing
2. Implied agency is implied from the acts of the principal, from his silence or lack of action or his failure to repudiate the agency knowing that another person is acting on his behalf without authority, or from the acts of the agent which carry out the agency, or from his silence or inaction according to the circumstances
B. As to character
1. Gratuitous agent receives no compensation for his services
2. Onerous agent receives compensation for his services
C. As to extent of business of the principal
1. General agency comprises all the business of the principal
2. Special agency comprises one or more specific transactions
D. As to authority conferred
1. Couched in general terms agency is created in general terms and is deemed to comprise only acts in the name and representation of the principal
2. Simple or Commission agent acts in his own name but for the account of the principal