Answers to Public Goods Questions
Answers to Public Goods Questions
3.1)
a) Radio, TV transmissions, etc.
b) UK, Meals for elderly? vouchers for child care.
c) Airports.
3.2)
Σi MRS(i) = Σi MUPublicgood(i) /MUPrivategood(i) = MRT
3.3)
First note as the sum of benefits is greater than the sum of costs it is efficient for the
project to go ahead.
IN this context the Clark Grove procedure is
1) People announce net values.
2) If the sum of the net values are positive the project goes ahead. If they are negative it does not.
3) Let S(-i) denote the sum of everyone’s report apart from player i and let S be the sum of the reports.
3) If a person’s report does not change the sign of the sum of reported values
(i.e. S x S(-i)>0), then they are not charged anything. If a person’s report changes the sign from negative to positive i.e. S>0>S(-i) then person i is charged –S(-i). If a person changes the sign from positive to negative i.e. S(-i)>0>S that person is charged S(-i).
In this case we showed it is optimal to report truthfully. Here’s what happens under truthful reporting
PERSON Report S S(-i) Payment
A 150 150 0 0
B 200 150 -50 50
C 300 150 -150 150
D -300 150 450 0
E 200 150 350 0
Suppose voter D wanted to stop the project then he would have to announce -450. The project would not go ahead but he would have to pay -450 which is worse than the -300 he gets if the project goes ahead.
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