Tradeoffs between Time Allocations to Maintenance Activities/Travel and Discretionary Activities/Travel
AbstractThis paper focuses on the tradeoff in time allocation between maintenance activities/travel and discretionary activities/travel. We recognize that people generally must travel a minimum amount of time in order to allocate one unit of time to the activity. This minimum amount of travel is represented by the travel time price, a ratio obtained by dividing the total amount of time traveling to maintenance or discretionary activities by the total amount of time spent on activities of the same type; it is the time equivalent of the monetary price for performing an activity. Using the San Francisco Bay Area 1996 Household Travel Survey data and applying the Almost Ideal Demand System (AIDS) of demand equations, we found that with respect to the time equivalent of income elasticities of maintenance and discretionary activities, the former is less than unity and the latter is greater than unity. In other words, maintenance activities are a necessity and discretionary activities are a luxury. With respect to the own travel time price elasticities, if the travel time price of performing a certain type of activity increases (for reasons such as traffic congestion), one would reduce the time allocated to that type of activity. Time spent on maintenance activities is less elastic than the time spent on discretionary activities. As for the cross travel time price elasticities (changes in time allocated to activity type i in responses to changes in the time price for activity type j), we found that ɛ dm >0 and ɛ md >0, suggesting a substitution effect between maintenance and discretionary activities. Copyright Springer 2006
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Bibliographic InfoArticle provided by Springer in its journal Transportation.
Volume (Year): 33 (2006)
Issue (Month): 3 (05)
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Web page: http://www.springerlink.com/link.asp?id=103007
AIDS demand equations; time allocation; tradeoff; travel time price;
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