The utilization set C - the arrangement of all packages that the buyer might possibly consume. An inclination connection over the heaps of C. This inclination connection can be portrayed as an ordinal utility capacity, depicting the utility that the buyer gets from each group. A value framework, which is a capacity doling out a cost to each package. An underlying gift, which is a group from C that the customer at first holds. The shopper can sell all or a portion of his underlying group in the given costs, and can purchase one more pack in the given costs. He needs to conclude which pack to purchase, under the given costs and spending plan, to expand his utility.