The rhinoceros has been hunted to the brink of extinction because its horn is valued as an aphrodisiac in the Orient. This situation is an example of:

the problem of signaling.
a public good.
moral hazard.
the problem of the commons.

People who buy air conditioners rarely consider the effects that the coolant in the air conditioner will have on the ozone layer when the air conditioner is eventually discarded. Ignoring this aspect of the air conditioner causes:

a negative externality.
moral hazard.
monopsony problems.

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