Markets corrected by pollution taxes only lead to the efficient amount of pollution and satisfy the polluter pays principle if the taxes are set equal to the magnitude of the damage victims suffer. But because markets are not incentive compatible for polluters and pollution victims, markets provide no reliable way to estimate the magnitudes of efficient taxes for pollutants. Ambiguity over who has the property right, polluters or pollution victims, free rider problems among multiple victims, and the transaction costs of forming and maintaining an effective coalition of pollution victims, each of whom is affected to a small but unequal degree, all combine to render market systems incapable of eliciting accurate information from pollution victims about the damages they suffer, or acting upon that information even if it were known.