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If the air is polluted, or depletion of fish stocks in the open seas occurs, the cost of repairing that is not accounted for in the net output of polluters or fishing companies. Sometimes [[tax]] levies are therefore imposed. Nowadays the [[Kyoto protocol]] has inspired "emissions trading", where the right to pollute is bought and sold, which some regard as a strictly perverse activity. Others however argue it proves the ability of competitive markets to solve any problem of resource allocation (see also [[Flatulence]]).
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