Multinational oil corporations (MNOCs) are a strategically important group of multinational corporations (MNCs). There are now many MNOCs operating in both the private and public sectors with remarkably diverse characters, strategies and objectives. Handling large budgets, revenue and capital, and complex advanced technology, they are responsible for exploration, crude oil production, refining, and distribution. These very capacities enable MNOCs to make a number of positive contributions to the economic growth and development of the developing oil-producing countries in which they operate. In that regard, MNOCs engage extensively in joint marketing operations with their host countries in various parts of the world, and foreign funds injected by MNOCs' operations relieve the shortage of financial capital and make greater production possible.