Substitution and income effects and the law of demand - Khan Academy
https://www.khanacademy.org/economics-finance-domain/ap-microeconomics/unit-2-supply-and-demnd/micro-demand/v/substitution-and-income-effects-and-the-law-of-demand
WEBExplore three reasons for this: substitution effect (buying cheaper alternatives), income effect (extra money to spend), and decreasing marginal utility (less value from additional units), and see how each creates a downward-sloping demand curve.
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