Many people feel that, in recent years, there is no correlation between the amount of knowledge required to perform a certain job, and the salary recieved. For example, a surgeon working in the United States, studies 13 years in order to become fully qualified, and earns approximately 300,000 dollars a year. In contrast, a famous actor, who did not study in the University, earns well over a million dollars for a single movie. These differences, might prevent people form persuing a carees in...