a. Curve X, because if there is a negative externality, external costs are associated with
it: social costs = external costs + private costs, therefore the marginal social cost curve
must lie above the marginal private cost curve.
b. Curve Y, because if there is a negative externality, negative external costs are
associated with it: social costs = negative external costs + private costs, therefore the
marginal social cost curve must lie below the marginal private cost curve.
c. Curve X, because if there is a negative externality, external benefits are associated
with it: social costs = external benefits + private costs, therefore the marginal social cost
curve must lie above the marginal private cost curve.
d. Curve Y, because if there is a negative externality, negative external benefits are
associated with it: social costs = negative external benefits + private costs, therefore the
marginal social cost curve must lie below the marginal private cost curve.
If inflation in the United States rises relative to the inflation rate in Mexico, the dollar
will __________ in terms of the peso and the peso will __________ in terms of the
dollar.
a. remain unaffected; appreciate
b. remain unaffected; depreciate