1. How much is a consumer hurt by an increase in price (like a tax)? Three Methods to measure this: Change Consumer Surplus. Compensating Variation –The amount of income that must be given to restore old utility. Equivalent Variation –The amount of income that must be taken away from before to give new utility.

2. Example. In Springfield there are two goods: Pork chops x and Coca-Cola y. The utility function for the typical resident is u(x,y)= In 2000, p x =p y =1 and income is 100. In 2001, foot and mouth disease hits and p x goes up to 4 (and income is still 100). The Blair decides to try to compensate Springfield’s poor citizens. What should he do?

3. Consumer Surplus Method CS is the area under the demand curve. Change of CS is change of this area. Demand for x is So change in area is going to be

4. CV and EV methods Utility= In 2000, p x =p y =1, so utility = In 2001, p x =4, p y =1, so utility = Remember CV is how much m to add to 2001. EV is how much m to take away in 2000.

5. Comments on compensation. These 3 method are only the same when utility is quasi-linear. (This is due to income effects). The CS method is always going to yield results between the two other methods.