Economy is a system of mutual cooperation among different producers. It is with the combined efforts of different producers that the goods and services are produced. For example, a textile mill buys cotton from the farmer, machines from the machine industries and electricity from power-generating plants. Trains, trucks, buses and other means of transportation help in transporting the goods from one place to another. Without their mutual cooperation it is very difficult to manufacture the cloth. Thus mutual cooperation and coordination among different producers build a structure which is known as economy.