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A tax on vehicle emissions can efficiently induce all of the cheapest forms of abatement. Consumers could drive less, buy a smaller car with better gas mileage, use cleaner gasoline, and repair pollution control equipment (PCE). However, the technology is not yet available to measure and tax each car's total emissions. We thus investigate alternative instruments. In a simple model with identical consumers, we show conditions under which the same efficiency can be attained by the combination of a tax on gas, a tax on engine size , and a subsidy to PCE. In a model with heterogeneous consumers, the same efficiency can again be obtained, but only if each person's gasoline tax rate can be made to depend on the characteristics of the car. We solve for these first-best tax rates. Assuming that tax rates must be uniform across consumers, we then characterize second-best tax rates on gasoline and on characteristics.
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In this paper we assess the degree to which the current social security system redistributes income from rich to poor. We then estimate the impact of various proposed changes to social security on the overall redistributive effect of the system. Our analysis takes a steady state approach in which we assume participants work their entire lives and retire under a given system. Redistribution is measured on a lifetime basis using estimated earnings profiles for a sample of people taken from the PSID. We account for differential mortality, not only by gender and race, but also be lifetime income. Our results indicate that the current social security system redistributes less than is generally perceived, mainly because people with higher lifetime income live longer and therefore draw benefits longer. Remaining progressivity is reduced and even reversed by an increase in the assumed discount rate, since regressive taxes become more important relative to later progressive benefits. We find that many of the proposed changes to social security have surprising little effect on the redistribution inherent in the system.
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We explore the effects of environmental taxes that imprecisely target pollution. A review of actual policies indicates few (if any) examples of a true tax on pollution. More typically, environmental taxes target an input or output that is correlated with pollution. We construct a simple analytical general equilibrium model to calculate the optimum tax rate on the input of the polluting industry, in terms of key behavioral parameters, and we compare this imprecisely-targeted tax to an ideal tax on pollution. Finally, we consider incremental tax reforms such as a change in either tax from some pre-existing level. Using a utility-based money-metric measure of welfare, we examine the losses that arise from not taxing pollution directly. With no existing tax, under our plausible parameters, the welfare gain from an output tax is less that half the gain from an emissions tax.
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