The use of supply chain DEA models in operations management: A survey

Standard Data Envelopment Analysis (DEA) approach is used to evaluate the efficiency of DMUs and treats its internal structures as a “black box”. The aim of this paper is twofold. The first task is to survey and classify supply chain DEA models which investigate these internal structures. The second aim is to point out the significance of these models for the decision maker of a supply chain. We analyze the simple case of these models which is the two-stage models and a few more general models such as network DEA models. Furthermore, we study some variations of these models such as models with only intermediate measures between first and second stage and models with exogenous inputs in the second stage. We define four categories: typical, relational, network and game theoretic DEA models. We present each category along with its mathematical formulations, main applications and possible connections with other categories. Finally, we present some concluding remarks and opportunities for future research.Supply chain; Data envelopment analysis; Two-stage structures; Network structures

Union Power and Product Market Competition: Evidence from the Airline Industry

In this paper we specify and estimate a structural model which links product market competition and union power. The model has a two-stage setting in which wages are determined through bargaining between management and unions in the first stage, with a price-setting market game to follow in the second stage. Using data for eight European airlines from 1976-1994, we provide evidence on price-cost margins and the measurement of market power in a model of rent sharing. In particular, we provide evidence on the amount of rent being shifted and its impact on prices, wages, and consumer surplus. According to our estimates, the inefficiency resulting from rent-shifting is only 1.2 cents for every dollar of rent shifting. In this sense, the static impact of unions is largely on equity and less on efficiency: the winners are the unions and the losers the consumer, while economic efficiency is relatively unaffected. ZUSAMMENFASSUNG - (Gewerkschaftsmacht und Produktmarkt-Wettbewerb: Evidenz aus der Luftfahrtindustrie) In diesem Beitrag wird ein strukturiertes Modell spezifiziert und geschätzt, das den Zusammenhang zwischen Produktmarkt-Wettbewerb und Gewerkschaftsmacht abbildet. Das Modell ist zweistufig. In der ersten Stufe werden im Rahmen von Verhandlungen zwischen Management und Gewerkschaften die Löhne bestimmt und auf der zweiten Stufe folgt ein Preissetzungsspiel. Anhand von Daten für acht europäische Fluggesellschaften für die Zeit von 1976 bis 1994 läßt sich empirisch ein Zusammenhang zwischen Preis-Kostenspanne und der Messung der Marktmacht in einem Modell des "rent sharing" feststellen. Dabei wird speziell das Maß an Verlagerungen ökonomischer Renten untersucht und deren Einfluß auf Preise, Löhne und Konsumentenrente. Den Berechnungen folgend, beträgt die Ineffizienz, die aus dem "rent-shifting" resultiert, nur 1,2 Cent je Dollar. Somit betrifft die statische Wirkung der Gewerkschaften eher die Gleichheit als die Effizienz: die Gewinner sind die Gewerkschaften und die Verlierer die Konsumenten, während die Effizienz relativ unberührt bleibt.

A Bargaining Game model for performance assessment in network DEA considering sub-networks:A real case study in Banking

Several network-data envelopment analysis (DEA) performance assessment models have been proposed in the literature; however, the conflicts between stages and insufficient number of decision-making units (DMUs) challenge the researchers. In this paper, a novel game-DEA model is proposed for efficiency assessment of network structure DMUs. We propose a two-stage modeling, where in the first stage network is divided into several sub-networks; we at the same time categorize input variables to measure efficiency of sub-networks within each input category. In the second stage, we calculate efficiency of the network by aggregating efficiency scores of sub-networks within each category. In this way, the issue of insufficient number of DMUs when there are many input/output variables can be handled as well. One of the main contributions of this paper is assuming each category and stage as a player in Nash bargaining game. Using the concept borrowed from Nash bargaining game model, the proposed game-DEA model tries to maximize distances of efficiency scores of each player form their corresponding breakdown points. The usefulness of the model is presented using a real case study to measure the efficiency of bank branches

Optimal Transfers and Participation Decisions in International Environmental Agreements

The literature on international environmental agreements has recognized the role transfers play in encouraging participation in international environmental agreements (IEAs), but the few results achieved so far are overly specific and do not exploit the full potential of transfers for successful treaty-making. Therefore, in this paper, we develop a framework that enables us to study the role of transfers in a more systematic way. We propose a design for transfers using both internal and external financial resources and making “welfare optimal agreements” self-enforcing. To illustrate the relevance of our transfer scheme for actual treaty-making, we use a well-known integrated assessment model of climate change to show how appropriate transfers may be able to induce almost all countries into signing a self-enforcing climate treaty.Self-enforcing international environmental agreements, Climate policy, Transfers

Endogenous Costs and Price-Cost Margins

Empirical work on price-cost margins often treats costs as exogenous. Allowing for endogenous costs when estimating price-cost margins is the topic of this paper. Methodologically, the endogenous cost model we propose leads to an additional equation that allows for the simultaneity in price setting in the product and the input market (labor in our case). In other words, the usual two-equation set-up (demand and first-order condition in the product market) is generalized to include a third equation, which endogenizes costs. We implement the model using data for eight European airlines from 1976-1994, and show that the treatment of endogenous costs has important implications for the measurement of price-cost margins and the assessment of market power.endogenous costs, price-cost margins, rent sharing, airline industry

Simulating a Sequential Coalition Formation Process for the Climate Change Problem: First Come, but Second Served?

We analyze stability of self-enforcing climate agreements based on a data set generated by the CLIMNEG world simulation model (CWSM), version 1.2. We consider two new aspects which appear important in actual treaty-making. First, we consider a sequential coalition formation process where players can make proposals which are either accepted or countered by other proposals. Second, we analyze whether a moderator, like an international organization, even without enforcement power, can improve upon globally suboptimal outcomes through coordinating actions by making recommendations that must be Pareto-improving to all parties. We discuss the conceptual difficulties of implementing our algorithm.International Climate Agreements, Sequential Coalition Formation, Coordination through Moderator, Integrated Assessment Model, Algorithm for Computations

Union Power and Product Market Competition: Evidence from the Airline Industry

In this paper we specify and estimate a structural model which links product market competition and union power. The model has a two-stage setting in which wages are determined through bargaining between management and unions in the first stage, with a price-setting market game to follow in the second stage. Using data for eight European airlines from 1976-1994, we provide evidence on price-cost margins and the measurement of market power in a model of rent sharing. In particular, we find that the welfare effects of rent sharing work mainly through reducing firms’ profits, rather than consumers surplus. As a consequence the static impact of unions is more on equity rather than efficiency. ZUSAMMENFASSUNG - (Gewerkschaftsmacht und Produktmarkt-Wettbewerb: Evidenz aus der Luftfahrtindustrie) In diesem Beitrag wird ein strukturiertes Modell spezifiziert und geschätzt, das den Zusammenhang zwischen Produktmarkt-Wettbewerb und Gewerkschaftsmacht abbildet. Das Modell ist zweistufig. In der ersten Stufe werden im Rahmen von Verhandlungen zwischen Management und Gewerkschaften die Löhne bestimmt und auf der zweiten Stufe folgt ein Preissetzungsspiel. Anhand von Daten für acht europäische Fluggesellschaftenfür die Zeit von 1976 bis 1994 läßt sich empirisch ein Zusammenhang zwischen Preis-Kostenspanne und der Messung der Marktmacht in einem Modell des "rent sharing" feststellen. Dabei wird deutlich, daß sich Wohlfahrtseffekte des "rent sharing" hauptsächlich durch eine Verringerung der Unternehmensgewinne ergeben und nicht so sehr aus der Konsumentenrente. Daraus ergibt sich, daß der statische Einfluß der Gewerkschaften auch mehr auf Gleichheit als auf mehr Effizienz abzielt.efficiency; union power; market power; rent sharing; airline industry

Staying Together or Breaking Apart: Policy-Makers’ Endogenous Coalitions Formation in the European Economic and Monetary Union

In this paper, we analyze coordination of macroeconomic stabilization policies within the EMU by focusing, in a dynamic set-up, on asymmetries, externalities, and the existence of a multi-country context. We study how coalitions among fiscal and monetary authorities are formed and what are their effects on the stabilization of output and price. In particular, our attention is directed to study the consequences on these issues of different institutional contexts in which policy-makers may act. Among other results, we found that, in the presence of externalities, the occurrence of asymmetries is a necessary but not a sufficient condition for cooperation.Macroeconomic stabilization, EMU, coalition formation

Supply chains : ago-antagonistic systems through co-opetition game theory lens

Supply chain configurations, as hybrid governance structures, allow companies to be sufficiently integrated while keeping a certain level of flexibility. This enables them, on one hand, to converge towards common interests through the development of cooperation; and on the other hand, to diverge on their own interests by remaining in competition. This dynamics generates an ago-antagonistic system where both of these two concepts, namely cooperation and competition, simultaneously drive the supply chain. In the present article, this system is analyzed by using the co-opetition game theory developed by Brandenburger and Nalebuff (1996) in order to highlight the importance of such an apprehension of the supply chain approach.Supply chain; cooperation; competition; ago-antagonistic approach; co-opetition game theory