Portuguese Economic Journal

, Volume 18, Issue 1, pp 5–17 | Cite as

Do bad borrowers hurt good borrowers? A model of biased banking competition

  • David PeónEmail author
  • Manel Antelo
Original Article


This paper explores a two-bank model in which, first, one bank correctly estimates the probability of low-quality loan repayment while the other overestimates it, and second, both banks have identical convex costs when granting loans. In this context of optimistically biased banking competition, we show how the unbiased bank follows the biased competitor as long as the bias of the latter is not too large. This would favour bad borrowers, who get better credit conditions at the expense of good borrowers. As a consequence, the presence of a biased bank increases welfare as long as the expected default rate is sufficiently high. Contrariwise, in subprime markets, biased banking competition would be socially harmful.


Overoptimism Convex costs Externalities Crowding-out Credit financing 

JEL classification

G21 D62 G02 



The authors would like to thank Steffen Hoernig (the Editor) and two anonymous reviewers for the fruitful suggestions provided. In addition, the authors gratefully acknowledge the financial support received from the Xunta de Galicia (Spain) through Research Project ED431B2016/001 Consolidación e estruturación – 2016 GPC GI-2016 Análise económica dos mercados e institucións. This research has also received the funding of the Program for the “Consolidation and Structuring of Competitive Research Units - Research Networks (Redes de Investigación)” (Ref. ED341D R2016/014), Proxectos Plan Galego IDT, from the Xunta de Galicia (Spain).

Supplementary material

10258_2018_149_MOESM1_ESM.docx (642 kb)
ESM 1 (DOCX 641 kb)


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Copyright information

© ISEG 2018

Authors and Affiliations

  1. 1.Department of BusinessUniversity of CorunaA CoruñaSpain
  2. 2.Department of EconomicsUniversity of Santiago de CompostelaSantiago de CompostelaSpain

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