This paper estimates the role that technological change and car characteristics have played in the rate of fuel consumption of vehicles over time. Using data from the Spanish car market from 1988 to 2013, we estimate a reduced form equation that relates fuel consumption with a set of car characteristics. The results for the sales-weighted sample of vehicles show that energy efficiency would have improved by 32% and 40% for petrol and diesel cars respectively had car characteristics been held constant at 1988 values. However, the shift to bigger and more fuel-consuming cars reduced the gains from technological progress. Additionally, using the results of the fuel equation we show that, besides a natural growth rate of 1.1%, technological progress is affected by both the international price of oil and the adoption of mandatory emission standards. Moreover, according to our estimations, a 1% growth in GDP would modify car characteristics in such a way that fuel consumption would increase by around 0.23% for petrol cars and 0.35% for diesel cars.
jueves, 14 de julio de 2016
El consumo de los coches en España
Siguiendo con esta serie reciente sobre transporte, un paper muy interesante mira qué ha pasado con el consumo de los vehículos en España, y qué factores han determinado este consumo. Al igual que otros trabajos ya demostraron para EEUU, en España también podríamos haber avanzado mucho más en eficiencia, pero, la mejora se la comió la tendencia hacia coches más pesados y potentes.