RT Journal Article SR Electronic T1 Learning and Fatigue Effects Revisited: Investigating the Effects of Accounting for Unobservable Preference and Scale Heterogeneity JF Land Economics JO Land Econ FD University of Wisconsin Press SP 324 OP 351 DO 10.3368/le.90.2.324 VO 90 IS 2 A1 Czajkowski, Mikolaj A1 Giergiczny, Marek A1 Greene, William H. YR 2014 UL http://le.uwpress.org/content/90/2/324.abstract AB Using multiple choice tasks per respondent in discrete choice experiment studies increases the amount of available information. However, respondents’ learning and fatigue may lead to changes in observed utility function preference (taste) parameters, as well as the variance in its error term (scale); they need to be controlled to avoid potential bias. A sizable body of empirical research offers mixed evidence in terms of whether these ordering effects are observed. We point to a significant component in explaining these differences; we show how accounting for unobservable preference and scale heterogeneity can influence the magnitude of observed ordering effects. (JEL Q23, Q51)