The cost of the item: The essential interest relationship is between likely costs of a decent and the amounts that would be bought at those costs. By and large, the relationship is negative, implying that an increment in cost will incite a reduction in the amount requested, This negative relationship is encapsulated in the descending slant of the customer request bend. The supposition of a negative relationship is sensible and instinctive. For instance, assuming the cost of a gallon of milk were to ascend from $5 to a cost of $15, that would be a major cost increment, Such a critical cost increment makes the customer request less of that item at the cost of $15 in light of the fact that in addition to the fact that it is more costly, yet the new cost is entirely preposterous for a gallon of milk