Explain the concept of price cross elasticity of demand explain its practical importance?

Price cross elasticity of demand measures the responsiveness of the quantity demanded for one good when the price of another good changes. It helps identify whether two goods are substitutes (positive elasticity) or complements (negative elasticity). This concept is practically important for businesses and policymakers, as it informs pricing strategies, product positioning, and market analysis, allowing firms to anticipate changes in consumer behavior and adjust their offerings accordingly. Understanding cross elasticity can also influence decisions on taxation and regulation by highlighting the interdependencies between different markets.