When farmers raise hogs, there are a number of external costs. In particular, hogs
generate methane gas. If the marginal external cost is $100 per hog and the government
imposes a tax of $200 per hog, then at the equilibrium price and quantity of hogs:
too few hogs will be raised.
the price will be less than the marginal social cost.
the price will be less than the marginal social benefit.
the price will be less than the marginal cost to hog farmers.
A familiar example of a negative externality is traffic congestion. In principle, it should
be possible to internalize this externality by permitting drivers to negotiate rights to
drive during particular times. The most likely reason that these negotiations do NOT
happen is that:
most individuals are unfamiliar with the Coase theorem.
the transaction costs associated with identifying and establishing communication
among the many interested parties would be prohibitive.
agreements arising from such negotiations could not be enforced since the
Constitution guarantees all individuals freedom of access to all public roads.
lawyers would find a way to prohibit such negotiations unless they were actively
involved, thus making transaction costs prohibitive.
The Coase theorem states that, in the presence of externalities, a market economy will:
always reach an efficient solution.
never reach an efficient solution.
reach an efficient solution if transaction costs are sufficiently low and property
rights are well-defined.
reach an efficient solution only in the case of government regulation.
An externality is said to be internalized:
when individuals take external costs and benefits into account in their decision
making.
when the Coase theorem is irrelevant or cannot be applied.
when individuals successfully petition the government to ban or restrict activities
that generate negative externalities.
when individuals learn to adapt to negative externalities through introspection or
internal acceptance of what are viewed as unchangeable facts of life.