The many identical residents of Whoville love drinking Zlurp. Each resident has the following willingness to pay for the tasty refreshment:

Quantity	Willingness to Pay
(Dollars)
First bottle	10
Second bottle	8
Third bottle	6
Fourth bottle	4
Fifth bottle	2
Further bottles	0

The cost of producing a bottle of Zlurp is $3.50, and the competitive suppliers sell it at this price. (The supply curve is horizontal.)

Each Whovillian will consume

bottles and receive a consumer surplus of

.

Producing Zlurp creates pollution. Each bottle has an external cost of $1.

Taking this additional cost into account, total surplus per person in the allocation you previously determined decreases to

.

Cindy Lou Who, one of the residents of Whoville, decides on her own to reduce her consumption of Zlurp by 1 bottle.

Cindy's consumer surplus (ignoring the cost of pollution she experiences) is now

. Her decision total surplus in Whoville by

.

Mayor Grinch imposes a $1 tax on each bottle of Zlurp.

Consumption per person is now

bottles. This yields a per-person consumer surplus of

not including the cost of pollution, a per-person external cost of

, and government revenue of

per person. Total surplus per person is now

as a result of this policy. (Hint: Total surplus is equal to consumer surplus minus the external cost of pollution plus government revenue.)

Based on your calculations, you support the mayor's policy because it welfare compared to before the tax.