Economics Seminar: Levent Ülkü (ITAM)

ECONOMICS SEMINAR

Sequential Approval: A Model of “Likes”, Paper Downloads and

Other Forms of Click Behaviour

by

LEVENT ÜLKÜ

(ITAM)

DECEMBER 11, 2019

11:45-13:00

FASS 2034

Abstract: We consider a model of behaviour that generates a dataset of “approvals” for items in a list. Approval is distinct from choice in that it does not guarantee a final selection (e.g. filling a virtual shopping cart) or may not involve a final selection at all (e.g. online “Likes” or post sharing). We study the criteria that a list designer who wishes to maximise approval should follow to manipulate approver behaviour. Furthermore, we study more standard questions such as the identification, comparative statics and characterisation of the model. The primitives of the model are shown to be substantially pinned down by observed approval behaviour. The key property that drives the model is supermodularity in the item’s quality and position in the list.