Rohini Pande

Harvard University
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“The Price of Coal over Wire: Thermal Power Plant Location, Pollution and Child Health in India”

Joseph Shapiro

Yale University
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“Consequences of the Clean Water Act and the Demand for Water Quality”

Abstract: Since the 1972 U.S. Clean Water Act, government and industry have invested over $1 trillion to abate water pollution, or $100 per person-year. Over half of U.S. stream and river miles, however, still violate pollution standards. We use the most comprehensive set of files ever compiled on water pollution and its determinants, including 50 million pollution readings from 170,000 monitoring sites and a network model of all U.S. rivers, to study water pollution’s trends, causes, and welfare consequences. We have three main findings. First, water pollution concentrations have fallen substantially. Between 1972 and 2001, for example, the share of waters safe for fishing grew by 11 percentage points. Pollution was declining at even faster rates before 1972. Second, the Clean Water Act’s grants to municipal wastewater treatment plants, which account for $680 billion in expenditure, caused some of these declines. Through these grants, it cost around $1.5 million (2014 dollars) to make one river-mile fishable for a year. We find little displacement of municipal expenditure due to a federal grant. Third, the grants’ estimated effects on housing values are about a fourth of the grants’ costs; we carefully discuss welfare implications. Full Paper

James Stock

Harvard University
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“Cost Pass-Through to Higher Ethanol Blends at the Pump: Evidence from Minnesota Gas Station Data” and “RIN Pass-Through at Gasoline Terminals”

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Martin Weitzman

Harvard University
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“On a World Climate Assembly and the Social Cost of Carbon”

Abstract: This paper postulates the conceptually useful allegory of a futuristic “World Climate Assembly” (WCA) that votes for a single worldwide price on carbon emissions via the basic democratic principle of one-person one-vote majority rule.  If this WCA framework can be accepted in the first place, then voting on a single internationally-binding minimum carbon price (the proceeds from which are domestically retained) tends to counter self-interest by incentivizing countries or agents to internalize the externality.  I attempt to sketch out the sense in which each WCA-agent’s extra cost from a higher emissions price is counter-balanced by that agent’s extra benefit from inducing all other WCA-agents to simultaneously lower their emissions in response to the higher price.    The first proposition of this paper derives a relatively simple formula relating each emitter’s single-peaked most-preferred world price of carbon emissions to the world “Social Cost of Carbon” (SCC).  The second and third propositions relate the WCA-voted world price of carbon to the world SCC.  I argue that the WCA-voted price and the SCC are unlikely to differ sharply.  Some implications are discussed.  The overall methodology of the paper is a mixture of mostly classical with some behavioral economics. Full Paper

Wolfram Schlenker

Columbia University
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“Ground-Level Ozone and Corn Yields in the United States”

Abstract: US Corn yields have been growing exponentially since 1950. Technological breakthroughs (new varieties, fertilizer, machinery) have traditionally been identified as key driver of this growth. In the last 25 years (1990-2014), yields have grown at an average rate of 1.5% per year. While a warming climate is predicted to decrease yields over the next decade, projections are net of any trend, which have been treated as exogenous. Understanding the drivers of this trend is crucial for future food security. We provide new empirical evidence that there exists a nonlinear effect of ozone on US corn yields. Our county-level panel analysis links observed historic corn yields to various air pollution measures constructed from finescaled hourly pollution monitor data. We find a statistically significant critical threshold of 65 ppb for hourly daytime ozone, above which yields decline linearly in ozone. This is considerably higher than the 40 ppb threshold derived in controlled experiments that is used as a standard in Europe. Our linear exposure model gives superior yield predictions than the newly proposed secondary standard W126 by EPA. The reduction in peak ozone levels over the 25years is responsible for 44% of the observed trend in average corn yields. Further reductions will have no yield effect as peak ozone is now below 65ppb. A back-of-the envelope calculation reveals that the elimination of peak ozone have reduced global food prices of the four basic stale crops by roughly 10% and increased consumer surplus of these commodities by 100billion annually. While US farmers have seen increased yields, the reduction in prices offset these gains. Farmers outside the US lost through lower prices.

Billy Pizer

Duke University
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“Prices versus Quantities with Policy Updating”

Abstract: We explore how policy updates and intertemporal trading of regulated quantities change the traditional comparative advantage of prices versus quantities. Intertemporally tradable quantity regulation leads firms to set current prices equal to expected future prices. We show that policy updates can take advantage of this behavior to achieve the first best in all periods so price regulation is never preferred. If we assume policy updates are driven partly by political \noise,” however, prices can be preferred. Applied to climate change, we estimate a $2 billion advantage of quantities versus prices over five years, which could be reversed by political noise.