Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
In 2011 the US changed its automobile fuel economy standards from a uniform, fleet-wide average, miles-per-gallon target, to one that varies with car sizes. Smaller cars now must meet stricter standards. While the motive for any policy change can be disputed, the consequence of this change looks like environmental protectionism, because the favored larger cars are disproportionately assembled in the US. The change imposes costs on imported cars equivalent to a tariff of $50 to $200 per vehicle.