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Suppose an investor has exponential utility function U(x) = −exp(−ax) and an initial wealth level of...
An investor with unit wealth maximizes the expected value of the utility function U(x)=ax-bx^2/2 and obtains a mean-variance efficient portfolio. A friend of his with wealth W and the same utility function does the same calculation but gets a different portfolio return. However, changing b to b’ does yield the same result. What is the value of b’?
Question3 An investor has utility function U(w) n(w) and initial wealth 100. The investor has the choice of investing in a safe asset or a risky asset. $1 invested in the safe asset returns $1 with certainty. $1 invested in the risky asset returns $1.25 when the market state is "good" and returns $0.8 when the market state is "bad". The good state occurs with probability 2/3 and the bad state occurs with probability 1/3. Let x be the amount...
Suppose you are facing a lottery that has a payoff of 10b pounds with probability 0.01 and that of 0 with probability 0.99. You are an expected utility maximiser with a utility function,u(x) = −exp(−ax) where x is the payoff in money terms and a > 0 is a parameter. What is the risk premium for this lottery - describe the risk premium as a function of ‘a’ and ‘b’.
Consider the utility function u(x) = ax + b e^cx where a, b, c are positive scalars. (a) Compute the coefficient of absolute risk aversion. (b) Describe the risk attitude represented by u(x) and how it changes as x increases. (c) Write down the equations to determine the certainty equivalent and the risk premium of a gamble X for an individual with initial wealth w > 0. (d) What is the sign of the risk premium? How does the risk...
1. a. Two investors, A and B, are evaluating the same investment opportunity, which has an expected value of £100. The utility functions of A and B are ln(x) and x2, respectively. Which investor has a certainty equivalent higher than 100? Which investor requires the higher risk premium? b. (i) Describe suitable measures of risk for ‘loss-aversion’ and ‘risk aversion’. (ii) Concisely define the term ‘risk neutral’ with respect to a utility function u (w), where w is the realisation...
Gamma’s utility function over wealth levels w is given by u(w) = √ w. His initial wealth is $400. With probability π, Gamma will get into an accident that will result in a loss of $300. With probability (1 − π), Gamma does not have an accident, and hence suffers no loss. 1. Argue (mathematically) that Gamma is risk averse. 2. What is the expected value of Gamma’s loss? 3. ABC Inc. sells auto insurance. It charges a premium of...
i) Suppose that Mary’s utility function is where W is wealth. Is she risk averse? Suppose that Mary has initial wealth of $125,000. How much of a risk premium would she require to participate in a gamble that has a 50% probability of raising her wealth to $160,000 and a 50% probability of lowering her wealth to $90,000? ii) Suppose that Irma’s utility function with respect to wealth is U(W) = 100 + 80W − W2. Find her Arrow-Pratt risk...
Suppose James derives utility from two goods {x,y},
characterised by the following utility function: $u(x, y) =
2sqrt{x} + y$: his wealth is w = 10 let py = 1:
(a) What is his optimal basket if px = 0.50? What is her
utility?
(b) What is his optimal basket and utility if px = 0.20?
(c) Find the substitution effect and the income
effect associated with the price change.
(d) What is the change in consumer
surplus?
Suppose Linda...
1. Suppose that an individual has a wealth of $50,000 and the utility of U(W) = VW. This individual has the option of investing all wealth in risky stock, which is worth $100 per share, which will be worth $105 per share in a good state with probability 1/2 and $95 per share in a bad state with probability 1/2. Assume, the interest rate is zero. (a) Find the expected value and the expected utility of investing all wealth in...
Question 8: Suppose that Bibi's utility function for inter-temporal consumption is: U(C0.cl)-In(C0) + [0.4 * İn(C1)] where Cois his current period consumption, C, is his future period consumption. Bibi is endowed with mo 90,000 in this period (to) and mo -$500,000 in the next period (t1). And suppose there a perfect capital market in which Bibi can borrow and lend at 25% (risk-free). i. What is Bibi's optimal consumption bundle (i.e., the optimal level of current and future consumption) if...