The CARA and CRRA utility functions are both members of a more general class of utility functions called harmonic absolute risk aversion (HARA) functions. The general form for this function is where the various parameters obey the following restrictions: The reasons for the first two restrictions are obvious; the third is required so that U_ > 0.a. Calculate r (W) for this function. Show that the reciprocal of this expression is linear in W. This is the origin of the term harmonic in the functions name. b. Show that whenhis function reduces to the CRRA function. c. Use your result

The CARA and CRRA utility functions are both members of a more general class of utility functions called harmonic absolute risk aversion (HARA) functions. The general form for this function is where the various parameters obey the following restrictions: The reasons for the first two restrictions are obvious; the third is required so that U_ > 0.a. Calculate r (W) for this function. Show that the reciprocal of this expression is linear in W. This is the origin of the term harmonic in the functions name. b. Show that whenhis function reduces to the CRRA function. c. Use your result from part (a) to show that if ___, then r(W) is a constant for this function. d. Let the constant found in part (c) be represented by A. Show that the implied form for the utility function in this case is the CARA function given in Equation 7.35. e. Finally, show that a quadratic utility function can be generated from the HARA function simply by setting _ = _1. f. Despite the seeming generality of the HARA function, it still exhibits several limitations for the study of behaviour in uncertain situations. Describe some of these shortcomings.

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