In any society, incomes are at the basis of population's consumption. Consumer's incomes are the main factor that, due to their size, shape, dynamics, distribution in time, destination, etc., are the material premises for consumers' purchase or consumption behaviour, respectively. Largo sensu, population's consumption can be studied either through the prism of expenses and incomes of an individual, or through the prism of demand and offer of goods and services. The importance of statistical analysis of population's consumption resides first in the fact that it is the basis of economical and social policies regarding economic development and increase of the population's living standard; second, it is an informational support for both economic actors and population. The study contains an analysis of the evolution of the volume and consumption expense structure depending on income size.