Mechanism Design for Team Formation

Team formation is a core problem in AI. Remarkably, little prior work has addressed the problem of mechanism design for team formation, accounting for the need to elicit agents' preferences over potential teammates. Coalition formation in the related hedonic games has received much attention, but only from the perspective of coalition stability, with little emphasis on the mechanism design objectives of true preference elicitation, social welfare, and equity. We present the first formal mechanism design framework for team formation, building on recent combinatorial matching market design literature. We exhibit four mechanisms for this problem, two novel, two simple extensions of known mechanisms from other domains. Two of these (one new, one known) have desirable theoretical properties. However, we use extensive experiments to show our second novel mechanism, despite having no theoretical guarantees, empirically achieves good incentive compatibility, welfare, and fairness.Comment: 12 page

Endogenous Exchange Rate Pass-through when Nominal Prices are Set in Advance

This paper develops a model of endogenous exchange rate pass-through within an open economy macroeconomic framework, where both passthrough and the exchange rate are simultaneously determined, and interact with one another. Pass-through is endogenous because firms choose the currency in which they set their export prices. There is a unique equilibrium rate of pass-through under the condition that exchange rate volatility rises as the degree of pass-through falls. We show that the relationship between exchange rate volatility and economic structure may be substantially affected by the presence of endogenous pass-through. Our key results show that pass-through is related to the relative stability of monetary policy. Countries with relatively low volatility of money growth will have relatively low rates of exchange rate pass-through, while countries with relatively high volatility of money growth will have relatively high pass-through rates.

Endogenous Exchange Rate Pass-through when Nominal Prices are Set in Advance

This paper develops a model of endogenous exchange rate pass through within an open economy macroeconomic framework, where both pass-through and the exchange rate are simultaneously determined, and interact with one another. Pass-through is endogenous because firms choose the currency in which they set their export prices. There is a unique equilibrium rate of pass-through under the condition that exchange rate volatility rises as the degree of pass-through falls. We show that the relationship between exchange rate volatility and economic structure may be substantially affected by the presence of endogenous pass-through. Our key results show that pass-through is related to the relative stability of monetary policy. Countries with relatively low volatility of money growth will have relatively low rates of exchange rate pass-through, while countries with relatively high volatility of money growth will have relatively high pass-through rates.

Shifting paradigms: on the robustness of economic models to heavy-tailedness assumptions

The structure of many models in economics and finance depends on majorization properties of convolutions of distributions. In this paper, we analyze robustness of these properties and the models based on them to heavy-tailedness assumptions. We show, in particular, that majorization properties of linear combinations of log-concavely distributed signals are reversed for very long-tailed distributions. As applications of the results, we study robustness of monotone consistency of the sample mean, value at risk analysis and the model of demand-driven innovation and spatial competition as well as that of optimal bundling strategies for a multiproduct monopolist in the case of an arbitrary degree of complementarity or substitutability among the goods. The implications of the models remain valid for not too heavy-tailed distributions. However, their main properties are reversed in the very thick-tailed settingRobustness, heavy-tailed distributions, innovation and spatial competition, firm growth, Gibrat's law, optimal bundling strategies, multiproduct monopolist, Vickrey auction, value at risk, coherent measures of risk, monotone consistency

Optimal Bundling Strategies For Complements And Substitutes With Heavy-Tailed Valuations

We develop a framework that allows one to model the optimal bundling problem of a multiproduct monopolist providing interrelated goods with an arbitrary degree of complementarity or substitutability. Characterizations of optimal bundling strategies are derived for the seller in the case of long-tailed valuations and tastes for the products. We show, in particular, that if goods provided in a Vickrey auction or any other revenue equivalent auction are substitutes and bidders' tastes for the objects are not extremely heavy-tailed, then the monopolist prefers separate provision of the products. However, if the goods are complements and consumers' tastes are extremely thick- tailed, then the seller prefers providing the products on a single auction. We also present results on consumers' preferences over bundled auctions in the case when their valuations exhibit heavy-tailedness. In addition, we obtain characterizations of optimal bundling strategies for a monopolist who provides complements or substitutes for profit maximizing prices to buyers with long-tailed tastes.

Do Central Banks have Precautionary Demands for Expansions and for Price Stability? - Theory and Evidence

This paper analyses the impact of asymmetric preferences with respect to inflation and output by policymakers on interest-rate reaction functions and test for their existence. A modified New Keynesian framework which makes it possible to identify the dominant type of asymmetry is developed and related to the precautionary demand of policymakers for expansions and for low inflation. Using data for four G7 economies, the paper shows that, except for Germany, nonlinear and asymmetric behaviour is present. A main finding, for the US, is that after credibility-building and disinflation have been established, the monetary authority develops a greater precautionary demand for output expansions than for low inflation. This may generate a new type of inflation bias. Conversely, where, as is the case in the UK, credibility-building is still a concern for the authorities, managing the business cycle is dominated by concerns of the monetary authorities to keep inflation expectations low.

Bidding With Securities: Auctions and Security Design

We study security-bid auctions in which bidders compete by bidding with securities whose payments are contingent on the realized value of the asset being sold. Such auctions are commonly used, both formally and informally. In formal auctions, the seller restricts bids to an ordered set, such as an equity share or royalty rate, and commits to a format, such as first or second-price. In informal settings with competing buyers, the seller does not commit to a mechanism upfront. Rather, bidders offer securities and the seller chooses the most attractive bid, based on his beliefs, ex-post. We characterize equilibrium payoffs and bidding strategies for formal and informal auctions. For formal auctions, we examine the impact of both the security design and the auction format. We define a notion of the steepness of a set of securities, and show that steeper securities lead to higher revenues. We also show that the revenue equivalence principle holds for equity and cash auctions, but that it fails for debt (second-price auctions are superior) and for options (a first-price auction yields higher revenues). We then show that an informal auction yields the lowest possible revenues across all possible formal mechanisms. Finally, we extend our analysis to consider the effects of liquidity constraints, different information assumptions, and aspects of moral hazard.

Dollarization of Liabilities in Non-tradable Goods Sector

This paper questions the motivation of dollar indebtedness by firms of the non-tradable good sectors in a period of exchange rate pressure. Given the structure of banks' indebtedness and protection of banks' foreign lenders, a dollar denominated loan may allow firms to insure (partially) against the risk of an early liquidation of their projects if they turn out to be poor. Then it is shown that under dollarization of liabilities the government may be urged to soften monetary policy to induce a real appreciation that supports the domestic banking system. Therefore, it might be constrained in its ability to enforce an efficient regulatory policy.http://deepblue.lib.umich.edu/bitstream/2027.42/39764/3/wp380.pd

Is lumpy investment really irrelevant for the business cycle?

New-Keynesian (NK) models can only account for the dynamic effects of monetary policy shocks if it is assumed that aggregate capital accumulation is much smoother than it would be the case under frictionless firm-level investment, as discussed in Woodford (2003, Ch. 5). We find that lumpy investment, when combined with price stickiness and market power of firms, can rationalize this assumption. Our main result is in stark contrast with the conclusions obtained by Thomas (2002) in the context of a real business cycle (RBC) model. We use our model to explain the economic mechanism behind this difference in the predictions of RBC and NK theory.Lumpy investment, Sticky prices

Do Central Banks have Precautionary Demands for Expansions and for Price Stability?

This paper analyses the impact of asymmetric preferences with respect to inflation and output by policymakers on interest-rate reaction functions. A theoretical framework which makes it possible to identify the dominant type of asymmetry is developed and related to the precautionary demand of pol- icymakers for expansions and for low inßation. Using data for some G7 economies, the paper shows that, except for Germany, nonlinear and asym- metric behaviour is present. A main Þnding is that where credibility-building and disinflation has already been achieved, the monetary authorities develop a greater precautionary demand for output expansions than for low inflation. This may generate a new type of inflation bias. Conversely, where credibility- building is still a concern for the authorities, managing the business cycle is dominated by concerns of the monetary authorities to keep inflation expec- tations low.