2. The right of agents, factors or other contractors to commissions, may either be the subjeot of a special contract, or rest upon the quantum meruit. 9 C. & P. 559; 38 E. C. L. R. 227; 3 Smith's R. 440; 7 C. & P. 584; 32 E. C. L. R. 641; Sugd. Vend. Index, tit. Auctioneer
3. This compensation is usually the allowance of a certain, per centage upon the actual amount or value of the business done. When there is a usage of trade at the particular place, or in the particular business in which the agent is engaged, the amount of commissions allowed to auctioneers, brokers and factors, is regulated by such usage. 3 Chit. Com. Law, 221; Smith on Mere. Law, 54; Story, Ag. 326; 3 Camp. R. 412; 4 Camp. R. 96; 2 Stark. 225, 294.
4. The commission of an agent is either ordinary or del credere. (q. v.) The latter is an increase of the ordinary commission, in consideration of the responsibility which the agent undertakes, by making himself answerable for the solvency of those with whom he contracts. Liverm. Agency, 3, et seq.; Paley, Agency, 88, et seq.
5. In Pennsylvania, the amount missions allowed to executors and trustees is generally fixed at five per centum on the sum received and paid out, but this is varied according to circumstances. 1 9 S. & R. 209, 223; 4 Whart. 98; 1 Serg. & Rawle, 241. In England, no commissions are allowed to executors or trustees. 1 Vern. R. 316, n. and the cases there: cited. 4 Ves. 72, n.