A number of studies demonstrate that individual choice can be influenced by alternatives which should be irrelevant according to standard choice theory. In these studies it has been observed that introducing a decoy option, which is either asymmetrically dominated by a target option or which makes the target a compromise, increases the likelihood of choosing the target. A common feature of earlier research on decoy effects is the use of hypothetical choice tasks. The aim of this paper is to investigate decoy effects in a properly controlled experiment where subjects are given real incentives. Here, monetary gambles are used as alternatives. The results demonstrate that decoy effects persist despite the use of real incentives.
