At the heart of U.S. fuel economy standards currently being evaluated by the Trump administration is one attribute: a vehicle’s “footprint”—measured by the rectangle formed by the four points where a vehicle’s tires touch the ground. The attribute-based footprint standard is used to sort vehicles into bins with different compliance targets, with larger vehicles facing more modest requirements. Some have argued that this system incentivizes automakers to produce bigger vehicles, but there has been little concrete evidence to support this beyond a general trend toward light trucks and SUVs. That is, until now.

A new study in the May edition of The Review of Economics and Statistics evaluates attribute-based regulations, looking specifically at the weight-based standards in Japan. The study finds that the standards did indeed incentivize automakers to increase the weight of their vehicles. And while the weight-based standards are more efficient than a flat standard alone, they are twice as costly as a flat standard accompanied by credit trading.

“As automakers like Ford dramatically boost production of their pickups and SUVs, it’s clear that there is more driving their decisions than consumer preferences alone,” says co-author Koichiro Ito, an assistant professor at the Harris School of Public Policy. “Policy plays a substantial role, as our study indicates.”

Ito and his co-author James Sallee, an assistant professor at the University of California, Berkeley, studied Japan’s standards at a time when the government introduced an incentive for vehicles that exceeded their fuel economy target. This policy change—whereby vehicles were judged based on both weight, to be in compliance, and fuel economy, to receive the subsidy—allowed Ito and Sallee to examine how the targeted goal of the policy (i.e. fuel economy) changed relative to the attribute-based scheme (i.e. weight). They compared cars sold in 2008, before the policy change, to those in 2012.

The authors found that the weight-based system incentivized automakers to increase vehicle weight in order to fall into a less stringent compliance category. Ten percent of Japanese vehicles had their weight increased. Among the affected vehicles, the authors estimate that weight rose by 110 kilograms on average.

When comparing this to a flat standard, the flat standard reduced the weight of cars broadly, but cost more to comply. If those who achieve the flat standard are allowed to sell credits to those who do not, this credit trading reduced compliance costs, making the weight-based system twice as costly as the flat standard with credit trading.

“Having a flat standard with compliance trading where automakers can trade credits is the best option, improving fuel economy at a low compliance cost,” Ito says. “The U.S. fuel standards already have this trading scheme in place. Making a switch away from the footprint-based system and toward the most efficient policy option can be within reach.”

Areas of Focus: Energy Markets
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Energy Markets
Well-functioning markets are essential for providing access to reliable, affordable energy. EPIC research is uncovering the policies, prices and information needed to help energy markets work efficiently.
Transportation
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Transportation
Mobility is central to economic activity. Yet, a lack of fuel diversity and continued demand growth have made the transportation industry a major contributor to global pollution and carbon emissions....
Climate Law & Policy
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Climate Law & Policy
As countries around the world implement policies to confront climate change, EPIC research is calculating which policies will have the most impact for the least cost.
Fuel Economy Standards
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Fuel Economy Standards
Fuel economy standards are the United States’ cornerstone transportation policy aimed at reducing both oil consumption and greenhouse gas emissions. EPIC research is exploring whether these standards are structured optimally...