discrete equilibrium price dispersion an explicit solution of an equilibrium model with price setting firms and searching customers makes possible a number of comparativestatics predictions about how cost differences among firms search costs of customers and taxes will affect the mean and variance of the distribution of market prices another implication of the model is that a firm s demand depends on the difference between its price and the average price in the market

who is against immigration a cross country investigation of individual attitudes toward immigrants abstract this paper empirically analyzes economic and noneconomic determinants of individual attitudes toward immigrants within and across countries the two survey data sets used covering a wide range of developed and developing countries make it possible to test for interactive effects between individual characteristics and country level attributes in particular theory predicts that the correlation between pro immigration attitudes and individual skill should be related to the skill composition of natives relative to immigrants in the destination country skilled individuals should favor immigration in countries where natives are more skilled than immigrants and oppose it otherwise results based on direct and indirect measures of the relative skill composition are consistent with these predictions noneconomic variables also are correlated with immigration attitudes but they don t alter significantly the labor market results

investment in electricity markets with asymmetric technologies abstract capacity investments in electricity markets is one of the main issues in the restructuring process to ensure competition and enhance system security of networks we study competition between hydro and thermal electricity generators under demand uncertainty producers compete in quantities and each is constrained the thermal generator by capacity and the hydro generator by water availability we analyze a two period game emphasizing the incentives for capacity investments by the thermal generator we characterize both markov perfect and open loop equilibria in the markov perfect equilibrium investment is discontinuous in initial capacity and higher than it is in the open loop equilibrium however since there are two distortions in the model equilibrium investment can be either higher or lower than the efficient investment

multiproduct equilibrium price dispersion abstract the model of burdett and judd econometrica51 1993 955 969 is generalized to the case of may goods consumers choose the best price observed for each good there are two classes of equilibria those that involve constant expected profits for each good independently of price and those with increasing profits for each good in price a continuum of the latter type always exists these equilibria are qualitatively different than the unique equilibrium of the single good case journal of economic literature classification numbers d83 d43 l13

no vacancy the political geography of immigration control in advanced industrial countries this article presents a unique framework for analyzing the politics of immigration control in developed countries and reviews related political theories the author describes distinctive patterns of immigration in selected oecd countries and standard explanations the author argues that the costs and benefits of immigration are spatially unevenly distributed and explains how spatial concentrations affect costs and benefits as well as how local conditions population and the business community create support for and opposition to immigration evidence from great britain is used to support the framework control of immigration is due to the power of local constituencies in creating and maintaining a national political coalition local constituency preferences are a systematic but not exclusive feature that underpin the politics of immigration control other factors may have periodic impacts the case of great britain during 1955 81 illustrates the importance of disaggregated analysis cross national analyses will reveal the variation in level of impact japan and germany with similar economic and political histories indicate substantial differences in net demand for immigration conditions such as high rapidly increasing immigration proportions access to social services and higher unemployment may lead to hostility and less community support for immigration the theory is based on native immigrant competition over scarce resources variable business support depending upon the flexibility of local markets and potential for capital mobility and the dynamics of party competition as influenced by underlying structural conditions

generation investment equilibria with strategic producers part ii case studies this paper analyzes numerically the approach reported in the companion paper for identifying generation investment equilibria in an electricity market where the producers behave strategically to this end a two node illustrative example and a large scale case study based on the ieee reliability test system rts are examined and the results obtained are reported and discussed

capacity expansion equilibria in liberalized electricity markets an epec approach this paper presents a novel way to model the generation capacity expansion problem in a liberalized framework via a multi year bilevel equilibrium model in the upper level the competing generation companies maximize their individual profits while the lower level represents the market using a conjectured price response approach which allows us to vary the strategic spot market behavior to see how much the reigning competitive behavior impacts investment decisions the bilevel equilibrium model is formulated as an equilibrium problem with equilibrium constraints transformed into a mixed integer linear program and solved as such using diagonalization in order to verify equilibria we present a case study to apply this new modeling approach and to demonstrate that the proposed equilibrium problem with equilibrium constraints can have multiple solutions whose respective investments can vary

generation capacity expansion in a risky environment a stochastic equilibrium analysis we cast models of the generation capacity expansion type formally developed for the monopoly regime into equilibrium models better adapted for a competitive environment we focus on some of the risks faced today by investors in generation capacity and thus pose the problem as a stochastic equilibrium model we illustrate the approach on the problem of the incentive to invest agents can be risk neutral or risk averse we model risk aversion through the cvar of plants profit the cvar induces risk adjusted probabilities according to which investors value their plants the model is formulated as a complementarity problem including the cvar valuation of investments an illustration is provided on a small problem that captures several features of today s electricity world a choice often restricted to coal and gas units a peaky load curve because of wind penetration uncertain fuel prices and an evolving carbon market we assess the potential of the approach by comparing energy only and capacity market organizations in this risky environment our results can be summarized as follows a deterministic analysis overlooks some changes of capacity structure induced by risk whether in the capacity market or energy only organizations the risk neutral analysis also misses a shift towards less capital intensive technologies that may result from risk aversion last risk aversion also increases the shortage of capacity compared to the risk neutral view in the energy only market when the price cap is low this may have a dramatic impact on the bill to the final consumer the approach relies on mathematical programming techniques and can be extended to full size problems the results are illustrative and may deserve more investigation

price distribution in a random matching model abstract we derive a price distribution for a homogeneous good in a symmetric economy where sellers are in locations and choose prices and buyers choose locations randomly the equilibrium strategy of the sellers is a non atomic distribution

a multiple leader stackelberg model and analysis this paper presents a new multiple leader follower model that is a consistent extension of stackelberg s leader follower duopoly the development contrasts with other existing extensions by demonstrating how the leader firms can utilize the true reaction curve of the follower firms it also provides sufficient conditions for some useful convexity and differentiability properties of this function for the proposed model we conduct a static analysis and discuss the existence uniqueness and computation of an equilibrium solution as well as study certain issues regarding the relative profits of leader and follower firms since the cournot oligopoly and the stackelberg leader follower models are special cases of this model the analysis in this paper hopefully provides some further insights about these types of models

equilibria in an oligopolistic electricity pool with stepwise offer curves we study the equilibria reached by strategic producers in a pool based network constrained electricity market the behavior of each producer is modeled by a mathematical program with equilibrium constraints mpec whose objective is maximizing profit and whose complementarity constraints describe market clearing the joint solution of all these mpecs constitutes an equilibrium problem with equilibrium constraints epec the equilibria associated with the epec are analyzed by solving the strong stationarity conditions of all mpecs which can be linearized without approximation by mixed integer linear programming milp techniques the resulting mixed integer linear conditions can be reformulated as an optimization problem that allows establishing diverse objectives to differentiate among alternative equilibria

the economics of immigration this literature review concerns the impact of immigration on the economy of the host country focusing on the experience of the united states the emphasis is on the period from the 1970s to the 1990s the author shows that research earlier in this period generally concluded that the economic effects of immigration were positive but that more recent research on later migrations have generally concluded that immigration may be having an adverse effect on the earnings of native unskilled workers and be placing an increased burden on welfare programs the importance of such economic analysis for the formulation of appropriate migration policies is stressed

transmission expansion in an oligopoly considering generation investment equilibrium abstract transmission expansion planning tep is a sophisticated decision making problem especially in an oligopolistic electricity market in which a number of strategic price maker producers compete together a transmission system planner who is in charge of making tep decisions requires considering the future generation investment actions however in such an oligopolistic market each producer makes its own strategic generation investment decisions this motivates the transmission system planner to consider the generation investment decision making problem of all producers within its tep model the strategic generation investment problem of each producer can be represented by a complementarity bi level model the joint consideration of all bi level models one per producer characterizes the generation investment equilibrium that identifies the future evolution of generation investment in the market this paper proposes a tri level tep decision making model to be solved by the transmission system planner whose objective is to maximize the social welfare of the market minus the expansion costs and whose constraints are the transmission expansion limits as well as the generation investment equilibrium problem this model is then recast as a mixed integer linear programming problem and solved numerical results from an illustrative example and a case study based on the ieee 14 bus test system demonstrate the usefulness of the proposed approach

equilibrium price distribution with directed technical change abstract this paper studies a non degenerate price distribution for the homogeneous good within a model of endogenous directed technical change a probability density function is analytically derived and shown to be related to the technology and innovation parameters of the model

strategic generation investment using a complementarity approach this paper provides a methodology to assist a strategic producer in making informed decisions on generation investment a single target year is considered with demand variations modeled through blocks the strategic behavior of the producer is represented through a bilevel model the upper level considers both investment decisions and strategic production actions and the lower level corresponds to market clearing prices are obtained as dual variables of power balance equations rival uncertainties on offering and investment are characterized through scenarios the resulting model is a large scale mixed integer lp problem solvable using currently available branch and cut techniques results pertaining to an illustrative example and a case study are reported and discussed

generation capacity expansion in liberalized electricity markets a stochastic mpec approach this paper proposes a bilevel model to assist a generation company in making its long term generation capacity investment decisions considering uncertainty regarding the investments of the other generation companies the bilevel formulation allows for the uncoupling of investment and generation decisions as investment decisions of the single investing generation company are taken in the upper level with the objective to maximize expected profits and generation decisions by all companies are considered in the lower level the lower level represents the oligopolistic market equilibrium via a conjectured price response formulation which can capture various degrees of strategic market behavior like perfect competition the cournot oligopoly and intermediate cases

finding multiple nash equilibria in pool based markets a stochastic epec approach we present a compact formulation to find all pure nash equilibria in a pool based electricity market with stochastic demands the equilibrium model is formulated as a stochastic equilibrium problem subject to equilibrium constraints epec the problem is based on a stackelberg game where the generating companies gencos optimize their strategic bids anticipating the solution of the independent system operator iso market clearing a finite strategy approach both in prices and quantities is applied to transform the nonlinear and nonconvex set of nash inequalities into a mixed integer linear problem milp a procedure to find all nash equilibria is developed by generating holes that are added as linear constraints to the feasibility region the result of the problem is the set of all pure nash equilibria and the market clearing prices and assigned energies by the iso a case study illustrates the methodology and proper conclusions are reached

a tri level model of centralized transmission and decentralized generation expansion planning for an electricity market part ii we study a tri level integrated transmission and generation expansion planning problem in a deregulated power market environment the collection of bi level sub problems in the lower two levels is an equilibrium problem with equilibrium constraints epec that can be approached by either the diagonalization method dm or a complementarity problem cp reformulation this paper is a continuation of its part i in which a hybrid iterative algorithm is proposed to solve the tri level problem by iteratively applying the cp reformulation of the tri level problem to propose solutions and evaluating them in the epec sub problem by dm it focuses on the numerical results obtained by the hybrid algorithm for a 6 bus system a modified ieee 30 bus system and an ieee 118 bus system in the numerical instances the approximate nash equilibrium point for the sub problem can be verified by examining local concavity

international systems and domestic politics linking complex interactions with empirical models in international relations following older debates in international relations literature concerning the relative importance of domestic versus systemic factors newer debates emphasize interdependence among states and the complex interactions between systemic and domestic factors as globalization and democratization advance theories and empirical models of international politics have become more complicated we present a systematic theoretical categorization of relationships between domestic and systemic variables we use this categorization so that scholars can match their theory to the appropriate empirical model and assess the degree to which systemic factors affect their arguments we also present two advances at the frontier of these empirical models in one we combine hierarchical models of moderating relationships with spatial models of interdependence among units within a system in the other we provide a model for analyzing spatial interdependence that varies over time this enables us to examine how the level of interdependence among units has evolved we illustrate our categorization and new models by revisiting the recent international political economy ipe debate over the relationship between trade policy and regime type in developing countries

generation investment equilibria with strategic producers part i formulation the first of this two paper series proposes a methodology to characterize generation investment equilibria in a pool based network constrained electricity market where the producers behave strategically to this end the investment problem of each strategic producer is represented using a bilevel model whose upper level problem determines the optimal investment and the supply offering curves to maximize its profit and whose several lower level problems represent different market clearing scenarios this model is transformed into a mathematical program with equilibrium constraint mpec through replacing the lower level problems by their optimality conditions the joint consideration of all producer mpecs one per producer constitutes an equilibrium problem with equilibrium constraints epec to identify the solutions of this epec each mpec problem is replaced by its karush kuhn tucker kkt conditions which are in turn linearized the resulting mixed integer linear system of equalities and inequalities allows determining the epec equilibria through an auxiliary milp problem

what drives u s immigration policy evidence from congressional roll call votes abstract immigration is today one of the most hotly debated policy issues in the united states despite marked divergence of opinion even within political parties several important reforms have been introduced in the post 1965 era the purpose of this paper is to carry out a systematic analysis of the drivers of the voting behavior of us representatives on immigration policy in the period 1970 2006 and in particular to assess the role of economic factors at the district level our findings suggest that representatives from more skilled labor abundant districts are more likely to support an open immigration policy towards the unskilled whereas the opposite is true for representatives from more unskilled labor abundant districts this evidence is robust to the introduction of an array of additional economic and non economic characteristics of the districts and suggests that a simple factor analysis model can go a long way in explaining voting on immigration policy