After a century of exponential growth, the international oil industry suddenly slowed down in the 1970s, faltered during the 1980s, and by 1991 was just about back to its 1979 level. That break in trend of its dominance in world energy became clear in ‘the OPEC decade’ from 1973 onwards, gaining a surge of riches for oil-exporting countries. This book is a descriptive analysis of current influences in the world oil trade. It is concerned with a central unchanged paradox of the industry - its preoccupation with maximising the production of high-cost rather than low-cost oil. It follows the rise and decline of OPEC monopoly power in the crude market, and shows how growth in the international oil business has almost ceased since the late seventies, exploring the reasons behind this slow-down. The author has had twenty-five years of practical experience in petroleum economics.