This paper investigates the definition and estimation of income elasticity,and uses crosssection data to estimate the income elasticity of households who buy commercial houses in Beijing.

The paper indicates that urban residents basic demands tend to stabilization and more slowly rise than basic income,urban residents marginal consumption tendency is mostly affected by non-income factor,with the rise of citizen income,the income elasticity of commodity taking on different change tendency.

This paper imposes housing demand and motives model in terms of the factors of affecting housing demand and investigates the definition and estimates if income elasticity and price elasticity.

We should analyze the income flexibility and the price flexibility of housing need,and then to encourage the town residents housing consumption from raising residents income and the stabilizing housing prices.

Objective To describe the income elasticity of demand for medical service among the level countrymen with diffecent incomes.

Chinese urban residents′ consumption structure during ten vears′ period is andlysed,the Engel coefficient is measured and by using extended linear expenditure system,an analysis and forecast of the marginal propensity to consume along with the income elasticity of demand are pro.

The tap water s income elasticity of demand and price elasticity of demand is analyzed, along with the fluctuating range month by month of inhabitant s water consumption.