The income elasticity of demand of normal goods is

The income elasticity of demand of normal goods is positive. The income elasticity of demand measures the relationship between changes in income and changes in the demand for a good. A positive income elasticity of demand means that as income increases, the demand for the good also increases. In other words, as people become wealthier, they tend to buy more of the good. Normal goods are those goods for which demand increases as income increases. In contrast, a negative income elasticity of demand means that as income increases, demand for the good decreases. This is typically the case for inferior goods, which are goods for which demand decreases as income increases. A zero income elasticity of demand means that changes in income have no effect on demand for the good. This is rare, as most goods are either normal or inferior, and therefore have a positive or negative income elasticity of demand, respectively. A fixed income elasticity of demand is not a valid concept in economics. The income elasticity of demand is a continuous variable that can take on any positive or negative value, depending on the good in question and the specific circumstances of the market.