This article proposes and evaluates four hypotheses about US pollution and environmental policy over the last half century. First, air and water pollution have declined substantially, although greenhouse gas emissions have not. Second, environmental policy explains a large share of these trends....

This paper explores the empirical effects of decentralization on environmental quality by studying water pollution in rivers around the world. It examines the level of pollution and variation in pollution across jurisdictions within a country, for both a local and a regional pollutant. Federal...

Most US federal environmental policies allow states to assume responsibility for implementation and enforcement of regulations; states with this responsibility are referred to as "authorized'' or having "primacy.'' Although such decentralization may have benefits, it may also have costs with...

Using the most comprehensive data file ever compiled on air pollution, water pollution, environmental regulations, and infant mortality from a developing country, the paper examines the effectiveness of India's environmental regulations. The air pollution regulations were effective at reducing...

At political boundaries, local leaders often have weak incentives to reduce polluting activity because the social costs are borne by downstream neighbors. This paper exploits a natural experiment set in China in which the central government changed the local political promotion criteria and...

On the fortieth anniversary of the Clean Water Act this paper reports the first quantitative assessment of the aggregate trends in water quality in the U.S. using a single standard over the years 1975 to 2011. The analysis suggests that fresh water lakes for the nation as a whole are about at...

China's environmental regulators have sought to reduce the Yangtze River's water pollution. We document that this regulatory effort has had two unintended consequences. First, the regulation's spatial differential stringency has displaced economic activity upstream. As polluting activity...

This paper investigates the impact of a pioneering pollution reduction program, the Ecological Compensation Initiative (ECI) in China, which establishes side payments between upstream and downstream provinces along the same river. The program includes both Coasian and pay-for-performance...

The theory of international macroeconomics shows that domestic tax policy in a global economy affects foreign economic conditions via complex, dynamic interactions through relative prices, tax revenues, and wealth distribution. This paper proposes a tractable quantitative framework for assessing...

Tax reforms are sometimes touted to have strong macroeconomic growth effects. We consider the impact of a major tax reform on the long-term growth rates of the U.S. economy using three approaches. The first approach is to examine the historical record of the U.S. economy to evaluate whether tax...