Income elasticity of demand tends to be the one measuring the way demand responds to income changes. It is always positive for the normal good while negative for inferior good. Cross elasticity of demand tends to measure demand responsiveness for a respective good to another commodity's price changes.
Crosselasticityofdemand(Exy)=percentagechangeinpriceofYpercentagechangeinthedemandedQuantityofX
Incomeelasticityofdemand=ChangeinincomeChangeinquantitydemanded
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