The federal "sustainability standard" requires ethanol to emit at least 20 percent less carbon dioxide (CO2) than gasoline. Recent rulings by California and the Environmental Protection Agency, however, have cast doubt on the methodology of the sustainability calculus and whether those standards...

This paper analyzes the impact of an ethanol import tariff in conjunction with a consumption mandate and tax credit. A tax credit alone acts as a subsidy to ethanol producers, equally benefiting exporters like Brazil. If an import tariff is imposed to offset the tax credit, world prices of...

With a mandate, U.S. policy of ethanol tax credits designed to reduce oil consumption does the exact opposite. A tax credit is a direct gasoline consumption subsidy with no effect on the ethanol price and therefore does not help either corn or ethanol producers. To understand this, consider...