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2. Suppose Tony is deciding on buying an expensive road bike. There are three periods: Period 0 Tony decides to buy or not to buy the bike. The cost of the bike is equal to P utility units. (uo(buy) --P) Period 1 If Tony has bought the bike, then he has to decide if he is going out for a ride. If he goes for a ride, then his effort generates a utility cost of E units of utility. (111(ride) =-E) Period 2 If Tony has bought a bike and has ridden on it, then a health benefit equivalent to B utility units accrues. (u2(ride)-B) (a) Suppose Tony does not discount future utility. Which choices will he take in periods 0 and l if B > E + P? What will he do if B ? E + P? (b) Now suppose Tony is discounting future utility exponentially with a discount factor of & < 1 per period. Will Tony for any o buy the bike and then not ride it? Ex- plain why or why not? (You do not have to calculate anything here yet. Use your knowledge about how exponential discounters behave instead.) (c) Suppose Tony has a discount factor and P 2, E4 and B 8. What is he going to do in periods 0 and 1? (d) Is it possible that Tony for some values of B. E, P buys the bike and then does not ride it if he is a naive quasi-hyperbolic discounter. Give an intuition for why or why not instead of calculating (e) What if he is a sophisticated quasi-hyperbolic discounter? Explain (f) Suppose Tony is naive and absolutely patient in the long term (? = 1) but has a severe present bias (B-3). Assume again F-2. E-4 and B-8. Is he in period 0 expecting to ride in period 1 if he buys the bike? Is he actually going to ride if he has bought a bike and arrives at period 1? Is he going to buy the bike?

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