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05 Sep

2025

Kiel Trade Talks

Trade and Tariff Evasion in Oligopoly — Onur Koska

12:00

 – 

13:00

Speaker

Onur Koska (University of Canterbury)

Abstract

This paper incorporates trade tax evasion into an otherwise international oligopoly trade model with differentiated goods, following the empirical observation that evading customs duties and taxes predominantly takes place in such industries, due to a lack of globally standard prices. The results suggest that the optimal degree of trade tax evasion (i) decreases in the probability of inspection, in the cost of under-reporting, and/or in the penalty level; and (ii) increases in the rates of customs duties and taxes, which are consistent with the empirical evidence. By the same token, the greater is the number of domestic rivals and/or the lower is the domestic rivals’ production costs (the greater is the intensity of competition), the lower is import sales, and the higher is the optimal degree of trade tax evasion. In addition, the paper shows that the optimal degree of evasion decreases in the exporter’s price if the importer’s demand is export price inelastic, or increases in the exporter’s price if it is elastic.

Authors

Onur A. Koska (University of Canterbury) – John Gilbert (Utah State University) – Reza Oladi (Utah State University) – Omer Gokcekus (Seton Hall University)

Room

Colm Raum (A-111)

Colm Room & online – if interested, please send an Email to kcg-office@ifw-kiel.de to receive the Seminar-Link or to register for participation in Kiel.

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Contact

Organizers

  • Prof. Holger Görg, Ph.D.
    Research Director
  • Prof. Dr. Julian Hinz
    Research Director
  • Dr. Wan-Hsin Liu
    Kiel Institute Researcher
  • Frauke Steglich
    Kiel Institute Researcher
  • Vasundhara Thakur
    Kiel Institute Researcher

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