Demand  The demand is a very crucial concept in economics. The determination of price such goods, services and resources in a free market economy depends upon two opposite  force "demand" and "supply". In order to highlight the problem of price determination we initially take into account the concept of demand as under:    Definition of Demand  Common demand means a mere "wish" or "desire" to have a commodity. But in economics, at least two conditions must be fulfilled for the existence of demand.  (a) A strong "will" to purchase anything.  (b) Power to purchase a commodity.  According to Prof. Benham, " Demand is the quantity of a commodity which a Consumer are prepared to purchase at a certain price during a specific period  of time".     Law of Demand   Law of demand can be described in view of the functional relationship between    price and quantity demand. Our common observation is that; with the change in   the price o...