Template-Type: ReDIF-Paper 1.0 Author-Name: Burkhard Schipper Author-Name-First: Burkhard Author-Name-Last: Schipper Author-Name: Wenjun Ma Author-Name-First: Wenjun Author-Name-Last: Ma Author-Workplace-Name: Department of Economics, University of California Davis Title: Does Exposure to Unawareness Affect Risk Preferences? A Preliminary Result Abstract: One fundamental assumption often made in the literature on unawareness is that risk preferences are invariant to changes of awareness. We study how exposure to unawareness a ects choices under risk. Participants in our experiment choose repeatedly between varying sure outcomes and a lottery in 3 phases. All treatments are exactly identical in phase 1 and phase 3, but di er in phase 2. There are ve di erent treatments pertaining to the lottery faced in phase 2: The control treatment (i.e., a standard lottery), the treatment with awareness of unawareness of lottery outcomes but known number of outcomes, the treatment with awareness of unawareness of outcomes but with unknown number of outcomes, the treatment with unawareness of unawareness of some outcomes, and the treatment with an ambiguous lottery. We study both whether behavior di ers in phase 3 across treatments (between subjects e ect) and whether di erences of subjects' behavior between phases 1 and phase 3 di ers across treatments (within subject e ects). We observe no signi cant treatment e ects. Length: 33 File-URL: https://repec.dss.ucdavis.edu/files/THyDDnKvJxvyD2aSbxrrJEWo/16-2.pdf File-Format: application/pdf Number: 202 Classification-JEL: C91, C92, D81, D87 KeyWords: Unawareness, Awareness of unawareness, Risk aversion, Experiments. Creation-Date: 20160524 Handle: RePEc:cda:wpaper:202