1 1 Public Goods
14.01 Principles of Microeconomics, Fall 2007
Chia-Hui Chen
December 12, 2007
Lecture 35
Public Goods
Outline
1. Chap 18: Public Goods
1 Public Goods
Characteristics of public goods:
Nonrival. For any given level of production, the marginal cost of providing it
to an additional consumer is zero: enjoy it rather than use it up.
Nonexclusive. People cannot be e xcluded from consuming the go od. Difficult
to charge for its enjoyment.
Example (Roads).
Example (Streetlight). Once streetlight is setup, everyone can see the light
(nonexclusive).
It is more efficient to have government provide public goods. Government
provides and imposes tax.
Free-rider problem. Consumer need to pay for public goods, and they tend
to understate the value.
Example (Streetlight). Assume cost of building a street light is 1. A’s
and B’s reservation values for the s treet light are both 1, but they are not
known by government. Then government asks A and B to announce their
value. The street light will be built if
VA + VB � 1,
and people who have value share the cost. Their payoffs are shown in
Table 1). Therefore, A and B will both announce the value as 0. The
result is inefficient: consumers wait for others to pay for the public goods.
Cite as: Chia-Hui Chen, course materials for 14.01 Principles of Microeconomics, Fall 2007. MIT
OpenCourseWare (http://ocw.mit.edu), Massachusetts Institute of Technology. Downloaded on [DD Month
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