Marginalists a) Before the Marginal Revolution, what was the difficulty with treating "utility" as a casual determinant of market prices? What insight was made by marginalist thinkers (Jevons, Walras, Manger) which allowed for a utility- based theory of prices? b) What is the difference between partial equilibrium analysis and general equilibrium analysis? c) Who invented indifference curves and what did they use them for? Who invented isoquant and isocost curves and what did they use them for? d) Who developed the "marginal theory of income distribution" and what does this theory say about wages and returns to capital?