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Solutions to Exercises

Now we need to solve for u, d, R, and risk neutral probabilities. Empirical results tend to suggest, however, that this is not likely to be the case. Now only 1,0 is traded. To donalsson a complex security from A-D prices, make up the portfolio of AD securities providing the same state-by-state payoff as the security tgeory be priced and check what is the cost of this portfolio. These issues are at the heart of many political discussions in a world where redistribution across agents is not costless.

For agent 1, this is because he is risk neutral. Indeed, R A f U.

Solutions to Exercises

Recall that in equilibrium there should not be excess demand or excess supply for any good in the economy. It simply requires that the observed prices and returns, presumably the product of a large number of agents trading on the basis of heterogeneous beliefs, are consistent in the sense that no arbitrage opportunities are left unexploited. For an equally weighted portfolio: For full investment in the risky asset the first order condition has to satisfy the following: You may want to re-read the concluding comments of Chapter 1 at this stage.


The put option has payoffs [ 1,1,1,0]. Both models lead to a linear relationship explaining expected returns on individual assets and portfolios.

Beyond considerations of efficiency, however, considerations of social justice might suggest some non-optimal allocations are in fact socially preferable to some Pareto optimal ones. The rule we have derived in this chapter would, however, suggest that this is the wrong decision. The APT is agnostic about beliefs. Under uncertainty, the important quantities financual risk aversion coefficients, which depend on the first and second order derivatives.

The insurance xnd guarantees the expected payoff: In more general contexts, these payments may have distortionary effects.

Intermediate Financial Theory

Options and market completeness. Under the spelled out hypotheses, the futures price is the definite signal of production Equation It is determined by three considerations: Most of the financcial still go to agent 1; however, the incremental benefit to him is less than in the prior situation because the security is less well situated to his consumption smoothing needs. What is affected are the market clearing conditions: The return on the market portfolio could be one of them, however.

Write the problem of a risk neutral agent: This result means that the investor is going to invest in both securities — it is never optimal intermediare this situation to invest only in one of the two assets.

Donaldson Additional contact information John B. Math —1, Fall Solutions to the Final Examination. As a consequence, the increase in price may well lead to a fully rational increase in demand. A-D pricing focuses on the concept of theoy of nature and the pricing of future payoffs conditional on the occurrence of specific future states.


Agents will be happy to store the commodity for two reasons: Each chapter concludes with questions, and for the first time a freely accessible website presents complementary and supplementary material for every chapter. As a result the prices of A, C will rise and their expected returns fall. Yes, also, in a world where non-rational agents might be confused by the different contexts inteemediate which they are requested to make choices. The allocation is Pareto optimal, as expected from the fact that markets are now complete.

Since there is some probability of default, you must set the rate higher than rf in order to insure an expected return equal to rf. Agents like the former and dislike the latter.

For arbitrary assets that have the same statistical characteristics as M i. Solving the program for agent 1 gives the following FOC: In general one security is not sufficient to complete the markets when there are two future states. Massachusetts Institute of Technology.

Let w j be the proportion of economy wide wealth invested in asset j. This expression can be interpreted as p1 a demand function.