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Khan Academy
Khan Academy: Marginal Utility and Budget Lines: Types of Indifference Curves
Indifference curves for normal goods, substitutes and perfect complements
Khan Academy
Khan Academy: Optimal Point on Budget Line
This video [9:23] explains using indifference curves to think about the point on the budget line that maximizes total utility.
Khan Academy
Khan Academy: Indifference Curves and Marginal Rate of Substitution
A video [10:51] explaining indifference curves and marginal rate of substitution in graphing value tradeoffs between two goods.