The demand for health is also found to be income inelastic. The estimates of income elasticity of demand are in the range of 0 to 0.2. The positive sign of the elasticity measure indicates that as income increases, the demand for health care services also increases. The magnitude of the elasticity, however, suggests that the demand response is relatively small. Studies based on long time series data tend to report higher income elasticities. The difference in estimates across time frames is due to the incorporation of the effects of changes in medical technology in studies that use long time series of data.