Supply‐ vs. Demand‐Side Transparency: The Collusive Effects Under Imperfect Public Monitoring

Luke Garrod*, Matthew Olczak

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We analyse how market transparency affects collusion under imperfect monitoring where punishment phases occur on the equilibrium path. We show that increased transparency causes a ‘pro‐competitive’ demand‐side effect and an ‘anti‐competitive’ supply‐side effect on the optimal symmetric perfect public equilibrium (SPPE) profits. When transparency increases on both sides of the market, the optimal SPPE profits unambiguously increase at the perfect monitoring limit, because the pro‐competitive demand‐side effect vanishes. This result holds even when there is minimal structure on the competition game. The supply‐side effect also dominates away from the limit under reasonable conditions. We draw conclusions for policy.
Original languageEnglish
Pages (from-to)537-560
Number of pages24
JournalJournal of Industrial Economics
Issue number3
Publication statusPublished - 10 Dec 2021

Bibliographical note

© 2021 The Authors. The Journal of Industrial Economics published by Editorial Board and John Wiley & Sons Ltd.

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.


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