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Increasingly, algorithms are supplanting human decision-makers in pricing goods and services. To analyze the possible consequences, we study experimentally the behavior of algorithms powered by Artificial Intelligence (Q-learning) in a workhorse oligopoly model of repeated price competition. We find that the algorithms consistently learn to charge supracompetitive prices, without communicating with one another. The high prices are sustained by collusive strategies with a finite phase of punishment followed by a gradual return to cooperation. This finding is robust to asymmetries in cost or demand, changes in the number of players, and various forms of uncertainty.

We study the effects of reminders on people’s behavior in investment activities characterized by up-front costs and delayed benefits, such as getting an education and maintaining a healthy lifestyle. We conduct a field experiment and show that simple weekly reminders induce users of a gym to substantially increase their gym attendance over an extensive period. Users’ response to reminders is immediate (within hours) and recurrent for any subsequent reminder, which can be explained by limited attention. We find some evidence of habit formation, leading to more frequent physical activity also after treatment, although with an effect smaller than during treatment. Simple reminders are thus a cost-effective policy tool. Data are available at http://dx.doi.org/10.1287/mnsc.2016.2499 . This paper was accepted by Uri Gneezy, behavioral economics .

We propose a new theory of exclusive dealing. The theory is based on the assumption that a dominant firm has a competitive advantage over its rivals, and that the buyers' willingness to pay for the product is private information. In this setting, the dominant firm can impose contractual restrictions on buyers without necessarily compensating them, implying that exclusive dealing contracts can be both profitable and anticompetitive. We discuss the general implications of the theory for competition policy and illustrate by examples its applicability to antitrust cases.

This article unifies various approaches to the analysis of exclusive dealing that so far have been regarded as distinct. The common element of these approaches is that firms depart from efficient pricing, raising marginal prices above marginal costs. We show that with distorted prices, exclusive dealing can be directly profitable and anticompetitive provided that the dominant firm enjoys a competitive advantage over rivals. The dominant firm gains directly, rather than in the future, or in adjacent markets, thanks to the boost in demand it enjoys when buyers sign exclusive contracts. We discuss the implication of the theory for antitrust policy.

This paper examines whether multinational banks have a stabilizing or a destabilizing role during times of financial distress. With a focus on Europe, it looks at how these banks' foreign affiliates have been faring during the recent financial crisis. It finds that retail and corporate lending of these foreign affiliates has been stable and even increasing between 2007 and 2009. This pattern is related to the functioning of the internal capital market through which these banks funnel funds across their units. The internal capital market has been an effective tool to support foreign affiliates in distress and to isolate their lending from the local availability of financial resources, notwithstanding the systemic nature of the recent crisis. This effect has been particularly large within the EU integrated financial market and for the EMU countries, thus showing complementarity between economic integration and multinational banks' internal capital markets. In light of these findings, this paper supports the call for an integration of the European supervisory and regulatory framework overseeing multinational banks. The analysis is based on an analytical framework which derives the main conditions under which the internal capital market can perform this support function under idiosyncratic and systemic stresses. The empirical evidence uses both aggregate evidence on foreign claims worldwide, and firm-level evidence on the behaviour of banking groups' affiliates, compared to stand-alone national banks.

Pricing decisions are increasingly in the “hands” of artificial algorithms. Scholars and competition authorities have voiced concerns that those algorithms are capable of sustaining collusive outcomes more effectively than can human decision makers. If this is so, then our traditional policy tools for fighting collusion may have to be reconsidered. We discuss these issues by critically surveying the relevant law, economics, and computer science literature.

We study the effects of reminders on people's behavior in investment activities characterized by up-front costs and delayed benefits, such as getting an education and maintaining a healthy lifestyle. We conduct a field experiment and show that simple weekly reminders induce users of a gym to substantially increase their gym attendance over an extensive period. Users' response to reminders is immediate (within hours) and recurrent for any subsequent reminder, which can be explained by limited attention. We find some evidence of habit formation, leading to more frequent physical activity also after treatment, although with an effect smaller than during treatment. Simple reminders are thus a cost-effective policy tool.

We analyze firms that compete by means of exclusive contracts and market-share discounts (conditional on the seller's share of customers' total purchases). With incomplete information about demand, firms have a unilateral incentive to use these contractual arrangements to better extract buyers' informational rents. However, exclusive contracts intensify competition, thus reducing prices and profits and (in all Pareto undominated equilibria) increasing welfare. Market-share discounts, by contrast, produce a double marginalization effect that leads to higher prices and harms buyers. We discuss the implications of these results for competition policy.

Sectors with a long regulatory tradition have recently experienced intense activity by multinationals whose international operations and relocation threats represent a new cause for concern for regulators. I analyze a multinational serving two countries and being regulated by two national authorities. The firm is shown to favor, or cross-subsidize, the country with a larger stake in the firm's profit, and the linkage among national regulations may induce unexpected effects on outputs. I also analyze a multinational's lobbying decisions and its effects on national regulations. Finally, a credible threat to \"fly\" away from tough regulators lets the firm obtain larger profits.

Supervision of multinational banks (MNBs) by national supervisors suffers from coordination failures. We show that supranational supervision solves this problem and decreases the public costs of an MNB’s failure, taking its organizational structure as given. However, the MNB strategically adjusts its structure to supranational supervision. It converts its subsidiary into a branch (or vice versa) to reduce supervisory monitoring. We identify the cases in which this endogenous reaction leads to unintended consequences, such as higher public costs and lower welfare. Current reforms should consider that MNBs adapt their organizational structures to changes in supervision.