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We study how the mechanisms of choice influence preferences when animals face more than 2 alternatives simultaneously. Choice mechanisms can be hierarchical (if alternatives are assigned to categories by their similarity and choice is between categories) or simultaneous (if options enter the choice process individually, each with its own value). The latter, although simpler, can lead to counterintuitive outcomes because expressed preference between options depends not only on the kinds ofdoi:10.1093/beheco/arm005 fatcat:cfsrld473vbz3cdjpgrmuhlovu