Goods and services available on the global market trigger the need for the existence of the consumer price index. The CPI is practically a listing which displays the average price on a given a market of these services and products. The financial market continuously fluctuates, so in order to keep up a certain balance, a consumer price index listing is needed.

This index is based on calculating and comparing all the average indexes of certain services and products that are existent on the market. Inflation plays the number one role in what results the statistic of the consumer price index will give. There are some basic types of CPI representation, among which it is important to mention the CPI for Urban wage earners and Clerical workers and that reflecting the CPI for al urban consumers.