Abstract:
:The decoy effect is a cognitive bias documented in behavioural economics by which the presence of a third, (partly) inferior choice causes a significant shift in people's preference for other items. Here, we performed an experiment with human volunteers who played a variant of the repeated prisoner's dilemma game in which the standard options of "cooperate" and "defect" are supplemented with a new, decoy option, "reward". We show that although volunteers rarely chose the decoy option, its availability sparks a significant increase in overall cooperativeness and improves the likelihood of success for cooperative individuals in this game. The presence of the decoy increased willingness of volunteers to cooperate in the first step of each game, leading to subsequent propagation of such willingness by (noisy) tit-for-tat. Our study thus points to decoys as a means to elicit voluntary prosocial action across a spectrum of collective endeavours.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Wang Z,Jusup M,Shi L,Lee JH,Iwasa Y,Boccaletti Sdoi
10.1038/s41467-018-05259-5subject
Has Abstractpub_date
2018-07-27 00:00:00pages
2954issue
1issn
2041-1723pii
10.1038/s41467-018-05259-5journal_volume
9pub_type
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