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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
Time-inconsistent preferences. Consider an individual who lives for three periods. In period 1, his or her objective function is ln c1 + δln c2 + δln c3, where 0 < δ="">< 1.="" in="" period="" 2,="" it="" is="" ln="">2 + δln c3. (Since the individual’s period3 choice problem is trivial, the period-3 objective function is irrelevant.) The individual has wealth of W and faces a real interest rate of zero.
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(a) Find the values of c1, c2, and c3 under the following assumptions about how they are determined:
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(i) Commitment: The individual chooses c1, c2, and c3 in period 1.
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(ii) No commitment, naivete: The individual chooses c1 in period 1 to maximize the period-1 objective function, thinking he or she will also choose c2 to maximize this objective function. In fact, however, the individual chooses c2 to maximize the period-2 objective function.
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(iii) No commitment, sophistication: The individual chooses c1 in period 1 to maximize the period-1 objective function, realizing that he or she will choose c2 in period 2 to maximize the period-2 objective function.
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(b) (i) Use your answers to parts (a)(i) and (a)(ii) to explain in what sense the individuals’ preferences are time-inconsistent.
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(ii) Explain intuitively why sophistication does not produce different behavior than naivete.
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