Studying the Unbalanced Between Household's Income and Expenditure in Iran

After forty years period of implementing of households income and expenditure survey in Iran, the results show that in all years the mean of household income is less than their expenditures. While it can be resonable for some years because of economic problems but it's continious in such a long period show that this difference is not due to economic depression and may be a reflecting of under coverage or under statement of households income in the survey. In this study, analysing of the results of income and expenditure survey in period 1997-2001 show that this problem is not limited to a special group of household. Therefore, solve that problem the related questions in income section of household income and expenditure survey questionair should be design in a way that can present better coverage of household income.