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Evaluating the Law of one Price Using Micro Panel Data: The Case of the French Fish Market


  • Laurent Gobillon
  • François-Charles Wolff


This paper investigates spatial variations in product prices using an exhaustive micro dataset on fish transactions. The data includes all transactions between vessels and wholesalers that occurred within local fish markets in France during 2007. Spatial disparities in fish prices are sizable even after taking into account fish quality, time, and unobserved seller and buyer heterogeneity. The price difference between local fish markets can be explained to some extent by distance, but mostly by a coast effect related to market locations on the Atlantic and Mediterranean coasts. We also propose a new approach for identifying groups of interconnected local fish markets based on the activity of sellers and buyers within these markets. We show that most markets on the Atlantic coast are well connected, and that variation in prices across these markets is very small and in line with the law of one price.

Suggested Citation

  • Laurent Gobillon & François-Charles Wolff, 2016. "Evaluating the Law of one Price Using Micro Panel Data: The Case of the French Fish Market," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 98(1), pages 134-153.
  • Handle: RePEc:oup:ajagec:v:98:y:2016:i:1:p:134-153.

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    1. repec:eee:transe:v:104:y:2017:i:c:p:150-164 is not listed on IDEAS
    2. Laurent Gobillon & Wolff Francois Charles, 2017. "The local effects of an innovation: Evidence from the French fish market," PSE Working Papers halshs-01431160, HAL.
    3. Adland, Roar & Cariou, Pierre & Wolff, Francois-Charles, 2017. "What makes a freight market index? An empirical analysis of vessel fixtures in the offshore market," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 104(C), pages 150-164.
    4. Adland, Roar & Cariou, Pierre & Wolff, Francois-Charles, 2016. "The influence of charterers and owners on bulk shipping freight rates," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 86(C), pages 69-82.

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