ANOTHER LOOK AT THE INCOME ELASTICITY OF NON-POINT SOURCE AIR POLLUTANTS: A SEMIPARAMETRIC APPROACH
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In this paper, a semiparametric model is used to examine the relationship between pollution and income for three non-point source pollutants. Statistical tests reject the quadratic specification in favor of the semiparametric model in all cases. However, the results do not support the inverted-U hypothesis for the pollution-income relationship.