Increasing foreign direct investment (FDI) flows accompanied with globalization have raised the concern of a "race to the bottom" phenomenon in environmental protection. This is because footloose investors of "dirty" industries tend to relocate to "pollution havens" of the developing world. However when pollutant is transboundary (as in the case of greenhouse gases), the source country's incentive to relocate and the recipient country's willingness to host such industries are not straightforward. This article studies the relationship between FDI and environmental regulation using a North-South market share game model in a two-country setting, when pollution is transboundary. Contrary to the pollution haven hypothesis, our model shows that if market sizes of the two countries are small, FDI will raise the emission standard of the host country, resulting in a "race-to-the-top" phenomenon; but if market sizes are large enough, FDI will not change the emission standard of the South (from its laxest form), a finding that is consistent with the "regulatory chill" argument. Equilibrium FDI is contingent on the fixed cost of FDI, as the traditional proximity-concentration tradeoff theory predicts.

A polluted river network is populated with agents (e.g., firms, villages, municipalities, or countries) located upstream and downstream. This river network must be cleaned, the costs of which must be shared among the agents. We model this problem as a cost sharing problem on a tree network. Based on the two theories in international disputes, namely the Absolute Territorial Sovereignty (ATS) and the Unlimitted Territorial Integrity (UTI), we propose three different cost sharing methods for the problem. They are the Local Responsibility Sharing (LRS), the Upstream Equal Sharing (UES), and the Downstream Equal Sharing (DES), respectively. The LRS and the UES generalize Ni and Wang ("Sharing a polluted river", Games Econ. Behav., 60 (2007), 176-186) but the DES is new. The DES is based on a new interpretation of the UTI. We provide axiomatic characterizations for the three methods. We also show that they coincide with the Shapley values of the three different games that can be defined for the problem. Moreover, we show that they are in the cores of the three games, respectively. Our methods can shed light on pollution abatement of a river network with multiple sovereignties.JEL classification: C71, D61, D62.

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This paper considers the Goyal and Moraga‐Gonzalez (2001) model of strategic R&D collaboration networks in the open economy framework. The R&D is the d'Aspremont and Jacquemin (1988) process innovation and collaboration takes the form of research joint ventures (RJV) in which firms cooperate in R&D but compete in product markets. Countries decide whether to establish free‐trade links while firms decide whether and with whom to form RJVs. A double‐layer pairwise stability concept is introduced to characterize equilibrium network structures. In contrast with conventional wisdom, it is shown that global free trade generally reduces collaborative R&D levels. We give conditions for which pairwise stable R&D networks are welfare maximizing. Stability and efficiency are congruent when R&D cost is either too high or too low. A large public spillover effect is detrimental to an R&D network when trade networks are regional.