The United States consumes a quarter of the world’s oil, compared to 8% for China. Even with high Chinese growth expected in coming years, the world will not run out of oil anytime soon. Over a trillion barrels of proven reserves exist, and more is likely to be found. But two-thirds of those proven reserves are in the Persian Gulf, and are thus vulnerable to disruption.In the past, rising prices had a strong effect on US oil consumption. Since the price spikes of the 1970’s, US oil consumption per dollar of GDP has fallen by half, which also reflects the...