NEWS
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• NEW (2026): RD Cooperation and Spillovers: Do Research Joint Ventures Improve Welfare?
  with Yassine Badra (PHEAAC, Université des Antilles, FR)
  and Huizhong Liu (Wenlan School of Business, Zhongnan University of Economics and Law, Wuhan, China).
  accepted for publication in Mathematical Social Sciences
  
  

• NEW (2026): Misperception, Self-Reported Probabilities and Long Term Care Insurance Take-Up in the United States
  with Thomas Blavet (CES, Université Paris 1 Panthéon Sorbonne, FR), Thomas Rapp (LIRAES, Université Paris Cité, LIEPP Sciences Po, FR) and Jonathan Sicsic (LIRAES, Université Paris Cité, LIEPP Sciences Po, FR) - new version

accepted for publication in International Journal of Health Economics and Management 

• Optimal Liability Rules for Human-AI Health Care Decisions
  with Olivier Musy (LIRAES, Université Paris Cité, FR)
  accepted for publication in Annals of Economics and Statistics

• Liability Law, Defensive Medicine and Healthcare Quality
  accepted for publication in The International Review of Law and Economics
  
  

• Behavioral Determinants of Blood Donation: New Insights from the French Context
  with Maria Errea (Office of Health Economics in London, UK) and Nicolas Sirven (The EHESP School of Public Health, FR)
  submitted

• NEW (2026): in French La responsabilité médicale à l'ère de l'intelligence artificielle : une analyse microéconomique
  avec Olivier Musy (LIRAES, Université Paris Cité, FR)
  à lire sur le site du Collège des Economistes de la Santé, blog CES, collection Synthèse.

Available upon request, please contact bertrand.chopard@u-paris.fr

Working papers

• Clinical Practice Guidelines and Liability
  with Ludivine Roussey (LIRAES, Université Paris Cité, FR)
  working paper being updated
  
  

• RD Cooperation and Spillovers: Do Research Joint Ventures Improve Welfare?
  was presented at the International Conference on Public Economic Theory, 23 - 25 June, 2025, Lisbon, Portugal.
  Session B8 :  Industrial Organization.
  Last presentation at the 2025 Annual Meeting of the Association of Southern European Economic Theorists, 30 October - 01 November, 2025, Morocco.
  Session 1B :  Industrial Organization.
  
  

• Creditor Concerns in Lay Hands: The Influence of Non-Professional Courts on Post-Default Recovery Rates
  with Régis Blazy (University of Strasbourg, EM Strasbourg, Sciences Po Srasbourg and LARGE, FR) and Ludovico Maria Cocco (Ca' Foscari University Venice, IT)
  working paper being updated

Work in progress

• Balance Billing in Health Care: When Physician Pricing Fails Social Efficiency
  by Yassine Badra (PHEAAC, Université des Antilles, FR) and Bertrand Chopard (LIRAES Univ. Paris Cité).

• Negligence Rule and Healthcare Provider's Incentives with Payment Schemes
  by Bertrand Chopard (LIRAES Univ. Paris Cité),

• NEW (Dec. 2025): Pretrial Settlement and Polarization of Beliefs in Medical Litigation
  by Bertrand Chopard (LIRAES Univ. Paris Cité).