In an economic system the main decisions are, for example, allocating resources like labour, capital and oil. Prices, too, are controlled. In a command economy, these decisions are taken by a central body, usually the government. This system contrasts that of a market economy where all the economic actors involved make decisions. The benefit of a planned economy is that the planning body has (supposedly) perfect information, and can make a better decision than in the market economy. Countries at war sometimes command their people to make things the war needs; the major powers in World War II did this.