Oil is essential to the prosperity of the industrialized world and it is a major component of the farming industry. The price of oil is reflected in most of the things we do in our everyday life. It impacts on the price of transport, the cost of goods and services, and the availability of many products, including food, water and shelter. For example you and your family might want to spend the holidays with relatives in another state, but a big determinate of whether or not you will go can depend on the price of gas for your car to get there. You might look into flying instead, and realize that airfare is also high because of what the airlines pay for gas. If Oil prices are too high, then these goods and services become more expensive like the example of the airfare, and economies experience inflation. If oil prices are too low, which would seem good to the general public, then consumers would be wasting this non-renewable resource, investors would not be attracted to the industry and oil producers would suffer. The members that make up OPEC would suffer. Oil prices that are too high and or too low are plainly unhelpful for oil producers, oil consumers and the United States at large. OPEC makes sure that the market is not under supplied with oil, forcing the prices to go higher, and also that the market is not over supplied so that the prices go too low. OPEC also speaks to other oil producers to encourage them to avoid over supplying the market. They do not always listen of course. Cartels such as oil suffer from a "collective action problem."" That is, every member has a motive to cheat on the cartel by increasing its production. For example, an individual country such as Iran can increase its oil revenues by expanding production as long as all other members stick to their quotas. However, all members have similar ideas to increase production. They all want a free ride on the collective revenue.