markets often work as if they were guided by a "malevolent invisible foot" that keeps kicking us to produce more of some things, and less of others than is socially efficient." As long as a market economy is in place, Albert and Hahnel favour Pigovian taxes over other solutions to environmental problems such as command and control, or the issuance of marketable permits. However, Hahnel, who teaches ecological economics at American University, argues that in a market economy businesses try to avoid the "polluter pays principle" by shifting the burden of the costs for their polluting activities to consumers. In terms of incentives, he argues this might be considered a positive development because it would penalize consumers for "dirty" consumption. However, it also has regressive implications since tax incidence studies show that ultimately it would be poor people who would bear a great deal of the burden of many pollution taxes. "In other words, many pollution taxes would be highly regressive and therefore aggravate economic injustice." He, therefore, recommends that pollution taxes be linked to cuts in regressive taxes such as social security taxes. Hahnel argues that Pigovian taxes, along with associated corrective measures advanced by market economists, ultimately fall far short of adequately or fairly addressing externalities. He argues such methods are incapable of attaining accurate assessments of social costs: 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. Class and hierarchy Advocates of parecon say the intention is that the four main ingredients of parecon be implemented with a minimum of hierarchy and a maximum of transparency in all discussions and decision-making. This model is designed to eliminate secrecy in economic decision-making, and instead encourage friendly cooperation