Salary is an issue that many people have strong opinions about, and the pay gap between top entertainers and sports stars on the one hand, and professionals in vital service sectors such as medicine and education on the other, have been quite controversial for sometime now. However, I personally think that, except in certain cases, the latter the group do not necessarily deserve higher pay than the former. One reason is that the cash flow of service sectors is significantly lower than that of sports and entertainment industries. People willingly spend trillions of dollars every year buying tickets to sports matches, concerts and movies, while the revenue in service sectors like education or medicine originates mainly from households in need of their services. And even then, those services have to be provided at a discount to guarantee proper access for all citizens regardless of their financial status. This means that the funds available to service providers like doctors ...