 The payment of commission as remuneration for services rendered or products sold is a common way to reward salespeople. Payments often are calculated on the basis of a percentage of the goods sold, a way for firms to solve the principal adjunct problem by attempting to realign employees' interests with those of the firm.One sales personnel are thus paid, in part or entirely, on the basis of products or services. Generally sold rather than being paid by the hour, by attempted sales, or by any other measure. Although many types of commission systems exist, the common form is known as on-target earnings in which commission rates are based on the achievement of specific targets that have been agreed upon between management and the sales personnel. Commissions are intended to create the strong incentive for employees to invest maximum effort into their work. One of the most common means of attempting to align principal and agent interests is to design a contract with incentives that track agent performance. The principal adjunct theory provides an explanation for the dissimilarities across the marketing firms in the types of compensation plans used by them, such as fixed salary, straight commission or a combination of both. Often, a firm embracing a commission structure may not involve employees, but may solely establish themselves using independent contractors. An example in the U.S. could be a real estate agent. A commission is not offered at most entities that receive donations or gifts. This is likely against the will of most donors. However, it is commonly argued that this would increase the motivation and efficiency of those requesting donations. Industries, where a commission is commonly paid include car sales, property sales, insurance broken, and many other sales jobs. In the United States, a real estate broker who successfully sells property might collect a commission of 6% of the sale price, but one who makes no sales will collect no compensation whatsoever.