Publications by PSE researchers

In this paper, we investigate the Investor-State Dispute Resolution Settlement (ISDS) framework, which governs dispute resolution between foreign investors and host states in many bilateral and multilateral trade agreements. We show that ISDS delivers fair justice in a one-shot setting. In a repeated-interaction setting however, it is prone to collusion to the benefit of all parties except the host states. Three factors are determinant: First, the investors are the sole parties able to file cases; Second, arbitrators' earning prospects depend on the investors' filing cases; And finally, treaties leave substantial discretion to arbitration courts in their interpretation of treaties' provisions. We give conditions for pro-business collusion between investors and arbitrators to develop and we show how it makes it profitable for foreign investors to file high-stake claims against states in response to new environmental, social or health regulations. Further, we address regulatory chill and show how the fear of ISDS attacks can hold back welfare improving regulation in the host country. Finally, we extend the model to show how regulatory chill affect policy-making in other countries in which the investor operates with similar activities.

We review the literature on the academic publishing sector with a particular focus on the questions raised by open access. Dwelling on insights from the literatures on two-sided markets and certification, we discuss the various options to promote open access as well as possible policies to regulate the publishing market.

We review the literature on the academic publishing sector with a particular focus on the questions raised by open access. Dwelling on insights from the literatures on two-sided markets and certification, we discuss the various options to promote open access as well as possible policies to regulate the publishing market.

This article addresses the issue of favoritism at the design stage of a complex procurement auction. A community of citizens procures a project but lacks the ability to translate its preferences into operational technical specifications. This task is delegated to a public officer who may collude with one of the firms in exchange of a bribe. We investigate a simple accountability mechanism that requires justifying one aspect of the technical decision determined by the alerts of competitors (alert-based accountability [ABA]). We find that relying on competitors enables the community to deter favoritism significantly more easily than random challenges. The penalty needed to fully deter corruption is independent of the complexity of the project. It depends on the degree of differentiation within the industry. In an illustrative example, we study the patterns of favoritism when corruption occurs under ABA and compare them with the patterns in the random challenge mechanism.

This paper investigates the impact on fiscal revenues of taxing a two-sided monopolistic platform offering personalized services to users and targeted advertising to sellers, based on the collection of users' personal data. We show that the introduction of a small tax on data collection, which has been proposed in the French context by Collin and Colin, fails to increase fiscal revenues if the value-added tax (VAT) rate is high enough, due to a tax base interdependence effect between the two taxes. Under a supermodularity condition on the platform's profit function as a function of its prices, this result generalizes to any per-unit tax. However, in some cases, an ad valorem tax on subscriptions or on advertising may raise fiscal revenues, irrespective of the VAT rate, as well as welfare.

This paper addresses the issue of favoritism at the design stage of complex procurement auctions. A local community of citizens wants to procure a complex good or project and lacks the ability to translate its preferences into operational technical specifications. This task is delegated to a public officer who may collude with one of the firms at the design stage of the procurement auction in exchange of a bribe. Assuming that it is prohibitively costly to provide a justification for many aspects, we investigate two simple accountability mechanisms that ask the public officer to justify one aspect of the project, with the threat of being punished if he fails: a random challenge mechanism and an alert-based mechanism that requires justifying one aspect on which the rivals of the winning contractor send a red ag. Relying on losing contractors enables the community to deter favoritism significantly more easily than the random challenge procedure as it allows to use information that is shared by potential contractors in the industry. The level of penalty needed to fully deter corruption is lower, independent of the complexity of the project and depends on the degree of differentiation within the industry. Below this threshold, favoritism occurs in some states of nature and we characterize and compare the different equilibrium patterns of corruption under both mechanisms. A more elaborate example suggests that the alert-based mechanism tends to lead to more standard specifications of projects.

This paper analyzes the joint design of fiscal and cap-and-trade instruments in climate policies under uncertainty. Whether the optimal mechanism is a mixed policy (with some firms subject to a tax and others to a cap-and-trade) or a uniform one (with all firms subject to the same instrument) depends on parameters reecting preferences, production, and, most importantly, the stochastic structure of the shocks affecting the economy. This framework is then used to address the issue of the non-cooperative design of climate regulation systems in various areas worldwide under uncertainty. We characterize the resulting ineficiency, we show how the Pareto argument in favor of merging ETS of different regions is reinforced under uncertainty, and we discuss the non-cooperative design of mixed systems.

In a dynamic model with overlapping generations of consumers, we study duopolistic competition when firms can price discriminate, at each period, between their previous customers and the consumers that they have never served. Long-term contracts are not enforceable. In (Markov-perfect) equilibrium, one firm charges higher prices to its past customers than to its new customers, as past customers have revealed their strong preferences for the firm; the other firm, however, rewards its previous customers by charging lower prices to them than to its new customers. This loyalty reward strategy comes from the interplay between the firms’ usual incentive to extract surplus from consumers with revealed strong preferences and their incentives to acquire information and to recognize their young loyal customers. The result also relies on the firms’ inability a priori to tell different generations apart. It is the outcome of the unique equilibrium of a simplified two-period (or T-period) version of the game and holds with forward-looking consumers who are impatient enough.

This paper proposes a dynamic model of duopolistic competition under behaviorbased price discrimination with the following property: in equilibrium, a firm may reward its previous customers although long term contracts are not enforceable. A firm can offer a lower price to its previous customers than to its new customers as a strategic means to hamper its rival to gather precise information on the young generation of customers for subsequent profitable behavior-based pricing. The result holds both with myopic and forward-looking, impatient enough consumers.

The number of patent applications and "bad" patents issued has been rising rapidly in recent years. Based on this trend, we study the overload problem within the Patent Office and its consequences on the firms' R&D incentives. We assume that the examination process of patent applications is imperfect, and that its quality is poorer under congestion. Depending on policy instruments such as submission fees and the toughness of the non-obviousness requirement, the system may result in a high-R&D equilibrium, in which firms self-select in their patent applications, or in an equilibrium with low R&D, opportunistic patent applications and the issuance of bad patents. Multiple equilibria often co-exist, which deeply undermines the effectiveness of policy instruments. We investigate the robustness of our conclusions as to how the value of patent protection is formalized, taking into consideration the introduction of a penalty system for rejected patent applications, as well as the role of commitment to a given patent protection policy.