Why a business must make a proft if it wants to succeed?

Like growth of body, the health of a business house is adjudged by the profit margin it attains in a financial year. Even the no profit no loss situation, is at all a good indicator. In fact,whether it is a proprietorship,partnership, limited co, every where you will see all energies being directed towards enhancing sales, thereby maximizing profit margin. The situation is different in govt. organisations, where social obligation plays a crucial role and they have to continue running the loss making white elephants by providing subsidies for indefinite periods.