Do physicians make too much money?

The average net income of physicians in the USA is more than four times the average net income of people working in all domestic industries in the USA. When critics suggest that physicians make too much money, defenders typically appeal to the following four prominent principles of economic justice: Aristotle's Income Principle, the Free Market Principle, the Utilitarian Income Principle, and Rawls' Difference Principle. I shall show that no matter which of these four principles is assumed, the present high incomes of physicians cannot be defended.