Anna Nagurney - Academia.edu (original) (raw)

Papers by Anna Nagurney

Research paper thumbnail of Securing the Sustainability of Global Medical Nuclear Supply Chains Through Economic Cost Recovery, Risk Management, and Optimization

International Journal of Sustainable Transportation, Jan 22, 2015

Research paper thumbnail of A Game Theory Model for a Differentiated Service-Oriented Internet with Duration-Based Contracts

Research paper thumbnail of Pharmaceutical supply chain networks with outsourcing under price and quality competition

International Transactions in Operational Research, Jul 1, 2013

Research paper thumbnail of Spatial price equilibrium with information asymmetry in quality and minimum quality standards

International Journal of Production Economics, Dec 1, 2014

Research paper thumbnail of Environmental Impact Assessment of Transportation Networks with Degradable Links in an Era of Climate Change

International Journal of Sustainable Transportation, May 1, 2010

Research paper thumbnail of Dynamics and equilibria of ecological predator–prey networks as nature’s supply chains

Transportation Research Part E-logistics and Transportation Review, 2012

Research paper thumbnail of An integrated multitiered supply chain network model of competing agricultural firms and processing firms: The case of fresh produce and quality

European Journal of Operational Research

Research paper thumbnail of Dynamics of quality as a strategic variable in complex food supply chain network competition: The case of fresh produce

Chaos: An Interdisciplinary Journal of Nonlinear Science, 2018

In this paper, we construct a competitive food supply chain network model in which the profit-max... more In this paper, we construct a competitive food supply chain network model in which the profit-maximizing producers decide not only as to the volume of fresh produce produced and distributed using various supply chain network pathways, but they also decide, with the associated costs, on the initial quality of the fresh produce. Consumers, in turn, respond to the various producers' product outputs through the prices that they are willing to pay, given also the average quality associated with each producer or brand at the retail outlets. The quality of the fresh produce is captured through explicit formulae that incorporate time, temperature, and other link characteristics with links associated with processing, shipment, storage, etc. Capacities on links are also incorporated as well as upper bounds on the initial product quality of the firms at their production/harvesting sites. The governing concept of the competitive supply chain network model is that of Nash Equilibrium, for wh...

Research paper thumbnail of Strict Quotas or Tariffs? Implications for Product Quality and Consumer Welfare in Differentiated Product Supply Chains

SSRN Electronic Journal, 2019

Research paper thumbnail of Quality in competitive fresh produce supply chains with application to farmers' markets

Socio-Economic Planning Sciences, 2017

Research paper thumbnail of Preface to “On a Paradox of Traffic Planning”

Transportation Science, Nov 1, 2005

Please scroll down for article-it is on subsequent pages With 12,500 members from nearly 90 count... more Please scroll down for article-it is on subsequent pages With 12,500 members from nearly 90 countries, INFORMS is the largest international association of operations research (O.R.) and analytics professionals and students. INFORMS provides unique networking and learning opportunities for individual professionals, and organizations of all types and sizes, to better understand and use O.R. and analytics tools and methods to transform strategic visions and achieve better outcomes. For more information on INFORMS, its publications, membership, or meetings visit http://www.informs.org

Research paper thumbnail of Spatial price equilibrium networks with flow-dependent arc multipliers

Optimization Letters, 2022

The spatial price equilibrium modeling framework, which emphasizes the importance of transportati... more The spatial price equilibrium modeling framework, which emphasizes the importance of transportation costs between markets, has been utilized in agricultural, energy, mineral as well as financial applications. In this paper, we construct static and dynamic spatial price equilibrium networks with flow-dependent arc multipliers, which expand the reach of applications. The static model is formulated and analyzed as a variational inequality problem, whereas the dynamic one is formulated as a projected dynamical system, whose set of stationary points coincides with the set of solutions of the variational inequality. Qualitative results are presented, along with an algorithm, the Euler method, which yields a time-discretization of the continuous-time adjustment processes associated with the product shipments from supply markets to demand markets. The algorithm is implemented and applied to compute solutions to numerical examples with flow-dependent arc multipliers addressing losses and/or gains, inspired by perishable agricultural products, and by financial investments. The results in this paper add to the literature on generalized networks as well as that on commodity trade.

Research paper thumbnail of Quality in competitive fresh produce supply chains with application to farmers' markets

Socio-economic Planning Sciences, Dec 1, 2017

Fresh produce supply chains have special characteristics, notably, that the quality of the produc... more Fresh produce supply chains have special characteristics, notably, that the quality of the product (fruit or vegetable) deteriorates continuously over time, even under ideal conditions. In this paper, we begin with explicit formulae for fresh produce quality deterioration based on chemistry and temperature and provide a path-based framework. We then focus on farmers' markets, the popularity of which has been growing due to consumers' greater awareness of and interest in product quality and emphasis on health. Farmers' markets, as examples of direct to consumer channels and shorter supply chains, are studied in the framework of game theory in both uncapacitated and capacitated versions. A case study of apples in Massachusetts, under various scenarios, including production disruptions, provides quantitative evidence of the applicability of our supply chain network approach.

Research paper thumbnail of Global supply chain networks and tariff rate quotas: equilibrium analysis with application to agricultural products

Journal of Global Optimization, Jun 6, 2019

Research paper thumbnail of Strict quotas or tariffs? Implications for product quality and consumer welfare in differentiated product supply chains

Transportation Research Part E-logistics and Transportation Review, Sep 1, 2019

We introduce a supply chain network equilibrium model with differentiated products, in which firm... more We introduce a supply chain network equilibrium model with differentiated products, in which firms compete on product quantities and quality. We then extend the model to include a strict quota or tariff. We establish the equivalence between the model with a strict quota and that with a tariff, when the quota constraint is tight, and the tariff corresponds to the equilibrium Lagrange multiplier associated with the constraint for the former model. Numerical examples reveal that although firms may benefit from the imposition of a quota or tariff, the welfare of consumers in the country imposing the instrument declines.

Research paper thumbnail of Strict Quotas or Tariffs? Implications for Product Quality and Consumer Welfare in Differentiated Product Supply Chains

Social Science Research Network, 2019

We introduce a supply chain network equilibrium model with differentiated products, in which firm... more We introduce a supply chain network equilibrium model with differentiated products, in which firms compete on product quantities and quality. We then extend the model to include a strict quota or tariff. We establish the equivalence between the model with a strict quota and that with a tariff, when the quota constraint is tight, and the tariff corresponds to the equilibrium Lagrange multiplier associated with the constraint for the former model. Numerical examples reveal that although firms may benefit from the imposition of a quota or tariff, the welfare of consumers in the country imposing the instrument declines.

Research paper thumbnail of Supply Chain Network Capacity Competition with Outsourcing: A Variational Equilibrium Framework

Social Science Research Network, 2017

This paper develops a supply chain network game theory framework with multiple manufacturers/prod... more This paper develops a supply chain network game theory framework with multiple manufacturers/producers, with multiple manufacturing plants, who own distribution centers and distribute their products, which are distinguished by brands, to demand markets, while maximizing profits and competing noncooperatively. The manufacturers also may avail themselves of external distribution centers for storing their products and freight service provision. The manufacturers have capacities associated with their supply chain network links and the external distribution centers also have capacitated storage and distribution capacities for their links, which are shared among the manufacturers and competed for. We utilize a special case of the Generalized Nash Equilibrium problem, known as a variational equilibrium, in order to formulate and solve the problem. A case study on apple farmers in Massachusetts is provided with various scenarios, including a supply chain disruption, to illustrate the modeling and methodological framework as well as the potential benefits of outsourcing in this sector.

Research paper thumbnail of Quality in competitive fresh produce supply chains with application to farmers' markets

Socio-Economic Planning Sciences, 2017

Fresh produce supply chains have special characteristics, notably, that the quality of the produc... more Fresh produce supply chains have special characteristics, notably, that the quality of the product (fruit or vegetable) deteriorates continuously over time, even under ideal conditions. In this paper, we begin with explicit formulae for fresh produce quality deterioration based on chemistry and temperature and provide a path-based framework. We then focus on farmers' markets, the popularity of which has been growing due to consumers' greater awareness of and interest in product quality and emphasis on health. Farmers' markets, as examples of direct to consumer channels and shorter supply chains, are studied in the framework of game theory in both uncapacitated and capacitated versions. A case study of apples in Massachusetts, under various scenarios, including production disruptions, provides quantitative evidence of the applicability of our supply chain network approach.

Research paper thumbnail of Tariffs and quotas in world trade: A unified variational inequality framework

European Journal of Operational Research, 2018

In this paper, we develop a unified variational inequality framework in the context of spatial pr... more In this paper, we develop a unified variational inequality framework in the context of spatial price network equilibrium problems that captures world trade policies in the form of tariff rate quotas, which are two-tiered tariffs, and that have been applied in practice to numerous commodities. The spatial price network equilibrium model allows for multiple supply markets and multiple demand markets in different countries as well as multiple transportation routes. The model is qualitatively analyzed and also related to models with trade policies such as ad valorem tariffs and strict quotas. A case study on the dairy industry focusing on the United States and France is presented to illustrate the modeling and computational framework with impacts of stricter quotas, higher over quota tariffs, as well as additional transportation routes assessed. The numerical examples reveal that although domestic producers can gain under tariff rate quotas, consumers may experience higher prices. Given the relevance of tariffs to global trade in the world today and discussions concerning the impacts, the framework constructed in this paper is especially timely.

Research paper thumbnail of Global supply chain networks and tariff rate quotas: equilibrium analysis with application to agricultural products

Journal of Global Optimization, 2019

Research paper thumbnail of Securing the Sustainability of Global Medical Nuclear Supply Chains Through Economic Cost Recovery, Risk Management, and Optimization

International Journal of Sustainable Transportation, Jan 22, 2015

Research paper thumbnail of A Game Theory Model for a Differentiated Service-Oriented Internet with Duration-Based Contracts

Research paper thumbnail of Pharmaceutical supply chain networks with outsourcing under price and quality competition

International Transactions in Operational Research, Jul 1, 2013

Research paper thumbnail of Spatial price equilibrium with information asymmetry in quality and minimum quality standards

International Journal of Production Economics, Dec 1, 2014

Research paper thumbnail of Environmental Impact Assessment of Transportation Networks with Degradable Links in an Era of Climate Change

International Journal of Sustainable Transportation, May 1, 2010

Research paper thumbnail of Dynamics and equilibria of ecological predator–prey networks as nature’s supply chains

Transportation Research Part E-logistics and Transportation Review, 2012

Research paper thumbnail of An integrated multitiered supply chain network model of competing agricultural firms and processing firms: The case of fresh produce and quality

European Journal of Operational Research

Research paper thumbnail of Dynamics of quality as a strategic variable in complex food supply chain network competition: The case of fresh produce

Chaos: An Interdisciplinary Journal of Nonlinear Science, 2018

In this paper, we construct a competitive food supply chain network model in which the profit-max... more In this paper, we construct a competitive food supply chain network model in which the profit-maximizing producers decide not only as to the volume of fresh produce produced and distributed using various supply chain network pathways, but they also decide, with the associated costs, on the initial quality of the fresh produce. Consumers, in turn, respond to the various producers' product outputs through the prices that they are willing to pay, given also the average quality associated with each producer or brand at the retail outlets. The quality of the fresh produce is captured through explicit formulae that incorporate time, temperature, and other link characteristics with links associated with processing, shipment, storage, etc. Capacities on links are also incorporated as well as upper bounds on the initial product quality of the firms at their production/harvesting sites. The governing concept of the competitive supply chain network model is that of Nash Equilibrium, for wh...

Research paper thumbnail of Strict Quotas or Tariffs? Implications for Product Quality and Consumer Welfare in Differentiated Product Supply Chains

SSRN Electronic Journal, 2019

Research paper thumbnail of Quality in competitive fresh produce supply chains with application to farmers' markets

Socio-Economic Planning Sciences, 2017

Research paper thumbnail of Preface to “On a Paradox of Traffic Planning”

Transportation Science, Nov 1, 2005

Please scroll down for article-it is on subsequent pages With 12,500 members from nearly 90 count... more Please scroll down for article-it is on subsequent pages With 12,500 members from nearly 90 countries, INFORMS is the largest international association of operations research (O.R.) and analytics professionals and students. INFORMS provides unique networking and learning opportunities for individual professionals, and organizations of all types and sizes, to better understand and use O.R. and analytics tools and methods to transform strategic visions and achieve better outcomes. For more information on INFORMS, its publications, membership, or meetings visit http://www.informs.org

Research paper thumbnail of Spatial price equilibrium networks with flow-dependent arc multipliers

Optimization Letters, 2022

The spatial price equilibrium modeling framework, which emphasizes the importance of transportati... more The spatial price equilibrium modeling framework, which emphasizes the importance of transportation costs between markets, has been utilized in agricultural, energy, mineral as well as financial applications. In this paper, we construct static and dynamic spatial price equilibrium networks with flow-dependent arc multipliers, which expand the reach of applications. The static model is formulated and analyzed as a variational inequality problem, whereas the dynamic one is formulated as a projected dynamical system, whose set of stationary points coincides with the set of solutions of the variational inequality. Qualitative results are presented, along with an algorithm, the Euler method, which yields a time-discretization of the continuous-time adjustment processes associated with the product shipments from supply markets to demand markets. The algorithm is implemented and applied to compute solutions to numerical examples with flow-dependent arc multipliers addressing losses and/or gains, inspired by perishable agricultural products, and by financial investments. The results in this paper add to the literature on generalized networks as well as that on commodity trade.

Research paper thumbnail of Quality in competitive fresh produce supply chains with application to farmers' markets

Socio-economic Planning Sciences, Dec 1, 2017

Fresh produce supply chains have special characteristics, notably, that the quality of the produc... more Fresh produce supply chains have special characteristics, notably, that the quality of the product (fruit or vegetable) deteriorates continuously over time, even under ideal conditions. In this paper, we begin with explicit formulae for fresh produce quality deterioration based on chemistry and temperature and provide a path-based framework. We then focus on farmers' markets, the popularity of which has been growing due to consumers' greater awareness of and interest in product quality and emphasis on health. Farmers' markets, as examples of direct to consumer channels and shorter supply chains, are studied in the framework of game theory in both uncapacitated and capacitated versions. A case study of apples in Massachusetts, under various scenarios, including production disruptions, provides quantitative evidence of the applicability of our supply chain network approach.

Research paper thumbnail of Global supply chain networks and tariff rate quotas: equilibrium analysis with application to agricultural products

Journal of Global Optimization, Jun 6, 2019

Research paper thumbnail of Strict quotas or tariffs? Implications for product quality and consumer welfare in differentiated product supply chains

Transportation Research Part E-logistics and Transportation Review, Sep 1, 2019

We introduce a supply chain network equilibrium model with differentiated products, in which firm... more We introduce a supply chain network equilibrium model with differentiated products, in which firms compete on product quantities and quality. We then extend the model to include a strict quota or tariff. We establish the equivalence between the model with a strict quota and that with a tariff, when the quota constraint is tight, and the tariff corresponds to the equilibrium Lagrange multiplier associated with the constraint for the former model. Numerical examples reveal that although firms may benefit from the imposition of a quota or tariff, the welfare of consumers in the country imposing the instrument declines.

Research paper thumbnail of Strict Quotas or Tariffs? Implications for Product Quality and Consumer Welfare in Differentiated Product Supply Chains

Social Science Research Network, 2019

We introduce a supply chain network equilibrium model with differentiated products, in which firm... more We introduce a supply chain network equilibrium model with differentiated products, in which firms compete on product quantities and quality. We then extend the model to include a strict quota or tariff. We establish the equivalence between the model with a strict quota and that with a tariff, when the quota constraint is tight, and the tariff corresponds to the equilibrium Lagrange multiplier associated with the constraint for the former model. Numerical examples reveal that although firms may benefit from the imposition of a quota or tariff, the welfare of consumers in the country imposing the instrument declines.

Research paper thumbnail of Supply Chain Network Capacity Competition with Outsourcing: A Variational Equilibrium Framework

Social Science Research Network, 2017

This paper develops a supply chain network game theory framework with multiple manufacturers/prod... more This paper develops a supply chain network game theory framework with multiple manufacturers/producers, with multiple manufacturing plants, who own distribution centers and distribute their products, which are distinguished by brands, to demand markets, while maximizing profits and competing noncooperatively. The manufacturers also may avail themselves of external distribution centers for storing their products and freight service provision. The manufacturers have capacities associated with their supply chain network links and the external distribution centers also have capacitated storage and distribution capacities for their links, which are shared among the manufacturers and competed for. We utilize a special case of the Generalized Nash Equilibrium problem, known as a variational equilibrium, in order to formulate and solve the problem. A case study on apple farmers in Massachusetts is provided with various scenarios, including a supply chain disruption, to illustrate the modeling and methodological framework as well as the potential benefits of outsourcing in this sector.

Research paper thumbnail of Quality in competitive fresh produce supply chains with application to farmers' markets

Socio-Economic Planning Sciences, 2017

Fresh produce supply chains have special characteristics, notably, that the quality of the produc... more Fresh produce supply chains have special characteristics, notably, that the quality of the product (fruit or vegetable) deteriorates continuously over time, even under ideal conditions. In this paper, we begin with explicit formulae for fresh produce quality deterioration based on chemistry and temperature and provide a path-based framework. We then focus on farmers' markets, the popularity of which has been growing due to consumers' greater awareness of and interest in product quality and emphasis on health. Farmers' markets, as examples of direct to consumer channels and shorter supply chains, are studied in the framework of game theory in both uncapacitated and capacitated versions. A case study of apples in Massachusetts, under various scenarios, including production disruptions, provides quantitative evidence of the applicability of our supply chain network approach.

Research paper thumbnail of Tariffs and quotas in world trade: A unified variational inequality framework

European Journal of Operational Research, 2018

In this paper, we develop a unified variational inequality framework in the context of spatial pr... more In this paper, we develop a unified variational inequality framework in the context of spatial price network equilibrium problems that captures world trade policies in the form of tariff rate quotas, which are two-tiered tariffs, and that have been applied in practice to numerous commodities. The spatial price network equilibrium model allows for multiple supply markets and multiple demand markets in different countries as well as multiple transportation routes. The model is qualitatively analyzed and also related to models with trade policies such as ad valorem tariffs and strict quotas. A case study on the dairy industry focusing on the United States and France is presented to illustrate the modeling and computational framework with impacts of stricter quotas, higher over quota tariffs, as well as additional transportation routes assessed. The numerical examples reveal that although domestic producers can gain under tariff rate quotas, consumers may experience higher prices. Given the relevance of tariffs to global trade in the world today and discussions concerning the impacts, the framework constructed in this paper is especially timely.

Research paper thumbnail of Global supply chain networks and tariff rate quotas: equilibrium analysis with application to agricultural products

Journal of Global Optimization, 2019

Research paper thumbnail of Environmental Networks: A Framework for Economic Decision-Making and Policy Analysis

This work presents a basis for environmental policy-making in terms of environmental networks. Th... more This work presents a basis for environmental policy-making in terms of environmental networks. This emphasizes the spatial nature of economic activity and pollution dispersal. It formulates integrated models for analyzing permits and taxes in firms, producers and consumers.