Which factor of production is paid "interest"?

Total consumer surplus in a market is measured as the

A) area bounded above the market clearing price and beneath the market demand curve. B) area bounded below the market clearing price and above the market supply curve. C) vertical distance from the horizontal (quantity) axis to the market clearing price. D) horizontal distance from the vertical (price) axis to the equilibrium quantity.

Suppose a man and a woman are in love and care for the other's happiness as well as their own consumption. Suppose the woman is more selfish than the woman UM = CM1/2 UW1/2 UW = CW2/3 UM1/3 They will maximize the joint happiness (UM + UW) where

a. CM = 100; CW = 0 b. CW = 100; CM = 100 c. 50 < CM < 100; 0 < CW < 50 d. 50 < CW < 100; 0 < CM < 50