Luxury goods have high income elasticity of demand: as people become wealthier, they will buy proportionately more luxury goods. This also means, however, that should there be a decline in income its demand will drop more than proportionately. Income elasticity of demand is not constant with respect to income, and may change sign at different levels of income. That is to say, a luxury good may become a necessity good or even an inferior good at different income levels.
© jayasriradio.info 2019