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Published byBenjamin Randall Modified over 8 years ago
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L12 Uncertainty
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Model with real endowments 1. Labor Supply (Labor-Leisure Choice) 2. Intertemporal Choice (Consumption-Savings Choice) 3. Uncertainty (Insurance) (Consumption across states of the world) Three Applications
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Uncertainty u Two States of the world: no rain and rain u Probabilities u Goods: consumption u Endowment: wealth in two states u Possibility of insurance
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Budget Constraint
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Uncertainty and Lotteries
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Translation: (“as if” markets)
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Expected value u Lottery (random variable) u Expected value: average payment u Examples
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Preferences and Utility u Uncertainty – special preferences u Bernoulli utility function u Von Neumann-Morgenstern utility (Expected utility)
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Risk aversion u Risk averse, Risk Loving, Risk neutral u Lottery u Risk aversion: better than
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Risk attitudes u Example 1: u Example 2: u Example 3:
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Indifference curves
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Marginal Rate of Substitution
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Choice of Insurance
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Fair vs. not fair Insurance u Fair Insurance u Not fair insurance u Why? u Free Entry and Law of Large Numbers
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Fair Insurance
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Not Fair Insurance When Insurance is not fair u In optimum: (First secret of happiness)
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