is sitting on one-quarter of the world's oil. Of the globe's oil producers, it has the greatest potential for sustained, large-scale expansion of production capacity-the amount of oil it could be pumping. The kingdom's production capacity has been increasing steadily for some time. Between 1960 and 1977, the Saudi share of OPEC production doubled; Saudi Arabia also accounted for 40 percent of the total increase in world produc- tion between 1970 and 1977. Some 20 percent of U.S. oil imports come...