A major achievement of the Organization of Petroleum Exporting Countries (OPEC) is that

A major achievement of the Organization of Petroleum Exporting Countries (OPEC) is that the price of crude oil has remained relatively stable. OPEC is an organization of 14 major oil-exporting countries, and one of its main functions is to regulate the supply of crude oil in the world market to maintain stable prices. OPEC uses various strategies such as production quotas and price targets to manage the global supply and demand of crude oil. As a result of these efforts, the price of crude oil has remained relatively stable over the years, which has helped to promote economic growth and stability in both oil-producing and oil-consuming countries.