Abstract
In this research, we will try to address the most prominent economic concepts that describe the living conditions of the Iraqi individual during the research period. We are looking at the changes that affect the individual income. Through it we get to his consumption pattern and how his income is distributed among the commodity and service groups. We also show whether the increase in income was equal or different among all individuals. What is the effect of this variation on consumer behavior using the price index during the research period? We will be exposed to estimating the consumption function, which is the relationship between consumption and income. Keynes stressed that consumer spending depends mainly on the level of individual income, but other factors can affect consumer demand. These factors are related to tastes, changes in the attractiveness of the commodity, changes in spending on advertising, the number of residents...etc. These factors allow the consumption function to move from its place and may affect the consumer's tendency. However, the consumer decision depends primarily on the individual's desire associated with the available income capacity. It should be noted that some factors affecting consumer spending other than income are difficult to integrate into the economic model for measuring the consumption function. This is because some of these factors are usually achieved as a result of the change in the psychological factors of the consumer or as a result of the change that occurs in the economic policies adopted by the government
