1. The choice of a social welfare function is rooted in an ethical theory. 2. The approach begins with the specification of a social welfare function . 3. Most economists specify social welfare functions that are intermediate between these two extremes. 4. It also exposits on and develops what became commonly called the social welfare function . 5. This welfare function marks the income, which a randomly selected Euro most likely belongs to. 6. This welfare function marks the income, which a randomly selected person is most likely to have. 7. In terms of the social welfare function , the different results depend on the elasticity of marginal utility. 8. Then the ability to create a social welfare function depends crucially on the ability to compare utility functions. 9. A social indifference curve drawn from an intermediate social welfare function is a curve that slopes downward to the right. 10. First, Philippe Michel studies the problem of the choice of a social welfare function that allows defining the social optimum.