Learning Contents:                                                              ·              Extension of Demand ·              Contraction of Demand    Introduction As the Law of Demand states, other things remaining constant, when the price of a commodity falls, consumers buy more of it; if the price of a commodity rises, they buy less of it. Therefore, the price may either go up or down and this cause the consumer to purchase less or more of a commodity respectively. Movements along the demand curve means moving ‘up or down’ the demand curve. When Pri...