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Microeconomics: Consumer Choice and Behavioral Economics

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  • Utility

    Utility is the enjoyment or satisfaction people receive from consuming goods and services, measured in utils.

  • Marginal Utility

    Marginal Utility is the change in total utility a person receives from consuming one additional unit of a good or service.

  • Law of Diminishing Marginal Utility

    The principle that consumers experience decreasing additional satisfaction as they consume more of a good or service during a given period.

  • Budget Constraint

    A budget constraint is the limited amount of income available to consumers to spend on goods and services.

  • Rule of Equal Marginal Utility per Dollar

    To maximize utility, consumers buy goods up to the point where the last unit of each good purchased provides equal marginal utility per dollar spent.

  • Marginal Utility per Dollar Formula

    Marginal Utility per Dollar = \(\frac{MU}{P}\), where MU is marginal utility and P is price.

  • Optimal Consumption Conditions

    1) Marginal utility per dollar spent must be equal across goods.
    2) Total spending must equal the budget constraint.

  • Effect of Price Decrease on Quantity Demanded

    If the price of a good decreases, quantity demanded usually increases for a normal good and decreases for an inferior good.

  • Individual vs Market Demand Curve

    The market demand curve is the horizontal sum of all individual demand curves for a good.

  • Social Influences on Consumer Choice

    Consumers' decisions are influenced by peers, culture, customs, religion, and celebrity endorsements, affecting perceived utility.

  • Network Externalities

    A situation where the usefulness of a product increases as more people use it, e.g., cell phones or apps for tablets.

  • Fairness in Consumer Behavior

    Consumers care about fairness and may act to treat others fairly, even at a personal financial cost.

  • Sunk Costs

    Sunk costs are costs that have already been paid and cannot be recovered; they should be ignored in decision-making.

  • Endowment Effect

    The tendency to value a good more highly simply because one owns it, leading to unwillingness to sell at market price.

  • Behavioral Economics

    The study of situations where people make choices that do not appear economically rational.

  • Three Common Behavioral Pitfalls

    1) Ignoring non-monetary opportunity costs.
    2) Failing to ignore sunk costs.
    3) Being unrealistic about future behavior.

  • Non-monetary Opportunity Costs

    Costs of using owned goods that could be sold or used otherwise, often overlooked in decision-making.

  • Giffen Goods

    Inferior goods with upward-sloping demand curves where demand increases as price rises, due to strong income effects.

  • Indifference Curves

    Curves showing combinations of goods that provide the same utility to a consumer.

  • Marginal Rate of Substitution (MRS)

    The rate at which a consumer is willing to trade one good for another while maintaining the same utility level.

  • Optimal Consumption Point

    The point where the budget constraint is tangent to the highest possible indifference curve, indicating maximum utility.