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The Psychology of Intertemporal Tradeoffs

Dr. Daniel Read

Tuesday, April 06, 2010, 01:00pm - 02:00pm

Durham Business School in the UK (currently at Yale for the year)

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It is commonly assumed that people make intertemporal choices by 'discounting'  the value of delayed outcomes, assigning discounted values independently to all options, and comparing the discounted values. We identify a class of anomalies to such alternative-based discounting models, which collectively show that options are not treated independently but rather comparatively: The time difference, or interval, between the options sometimes counts more and sometimes counts less as a whole than if it were divided into shorter subintervals (superadditivity and subadditivity, respectively), and whether the interval counts more or less depends on the money difference, or compensation, involved (inseparability). We develop a model that replaces alternative-based discounting with attribute-based tradeoffs. In our model, people make intertemporal choices by weighing how much more they will receive or pay if they wait longer against how much longer the wait will be, or, conversely, how much less they will receive or pay if they do not wait longer against how much shorter the wait will be. This model, called the tradeoff model, accommodates, in a psychologically plausible way, all anomalies that the discounting approach can and cannot address.

 

Background Readings:

http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1444094

Dr. Daniel Read