Lessons from Quantile Panel Estimation of the Environmental Kuznets Curve
18 Pages Posted: 9 Sep 2009
Date Written: August 20, 2009
Abstract
The Environmental Kuznets Curve (EKC) hypothesizes that the income-pollution relationship has an inverted U shape: pollution increases with income up to a turning point beyond which it decreases. The empirical literature has concentrated on estimation of this relationship at the mean employing longitudinal data, with the typical finding supporting the inverted U shape. Conditional mean estimation, however, can mask heterogeneities present at higher and/or lower quantiles of the emissions'' distribution, in addition to being more sensitive to the presence of outliers. We apply methods for conditional-quantile panel fixed effects models to the estimation of the income-pollution relationship on U.S. state-level data on NOx (nitrogen oxide) and SO2 (sulfur dioxide) pollutants over the period 1929-1994. Our results indicate that conditional mean methods provide too optimistic estimates about emissions reduction of NOx, as conditional-quantile methods suggest that the turning point of the relationship occurs at higher values of income; while the opposite is found for SO2. Another important lesson drawn is that the income-pollution relationship is sensitive to the presence of outliers in the data.
Keywords: Environmental Kuznets Curve, Panel Quantile Estimation, Income and the Environment
JEL Classification: Q56, C21, C23
Suggested Citation: Suggested Citation
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