Cross elasticity of demand can be mathematically expressed as the

The correct expression for cross elasticity of demand is: %change in quantity demanded of commodity X / %change in price of commodity Y This formula measures the responsiveness of the quantity demanded of one product (commodity X) to a change in the price of another product (commodity Y). In other words, it tells us how much the demand for commodity X changes when the price of commodity Y changes. If the result is positive, it means that the two products are substitutes, and an increase in the price of one leads to an increase in the demand for the other. If the result is negative, it means that the two products are complements, and an increase in the price of one leads to a decrease in the demand for the other.