Other related products price (Relative Price: Ps) when one of the higher prices, consumers will buy less of that type, and turned to buying another type, which can be substituted, such as when the price of pork increased consumers will consume less pork, beef, chicken, beef consumption turned to fish and so on instead of the best items that must be shared, or make up, such as sugar, coffee, oil and car yon etc. When coffee prices are high, consumers will have a decrease in coffee needs. At the same time, it will have less sugar.