human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "price competition in online combinatorial markets"
  Abstract: We consider a single buyer with a combinatorial preference that would like to purchase related products and services from different vendors, where each vendor supplies exactly one product. We study the general case where subsets of products can be substitutes as well as complementary and analyze the game that is induced on the vendors, where a vendor's strategy is the price that he asks for his product. This model generalizes both Bertrand competition (where vendors are perfect substitutes) and Nash bargaining (where they are perfect complements), and captures a wide variety of scenarios that can appear in complex crowd sourcing or in automatic pricing of related products. #R##N#We study the equilibria of such games and show that a pure efficient equilibrium always exists. In the case of submodular buyer preferences we fully characterize the set of pure Nash equilibria, essentially showing uniqueness. For the even more restricted "substitutes" buyer preferences we also prove uniqueness over {\em mixed} equilibria. Finally we begin the exploration of natural generalizations of our setting such as when services have costs, when there are multiple buyers or uncertainty about the the buyer's valuation, and when a single vendor supplies multiple products.

Connected through hyperedge HE-1 (induced by source paper "electronic markets with multiple submodular buyers"):
  with members:
    - "budgetary effects on pricing equilibrium in online markets"
    - "the pricing war continues on competitive multi item pricing"

Connected through hyperedge HE-2 (induced by source paper "seasonal goods and spoiled milk pricing for a limited shelf life"):
  with members:
    - "pricing policies for selling indivisible storable goods to strategic consumers"
    - "budgetary effects on pricing equilibrium in online markets"
    - "the pricing war continues on competitive multi item pricing"

Connected through hyperedge HE-3 (induced by source paper "the price of anarchy in auctions"):
  with members:
    - "a duality based unified approach to bayesian mechanism design"
    - "best response dynamics in combinatorial auctions with item bidding"
    - "simple mechanisms for agents with complements"
    - "the price of anarchy in large games"
    - "on the economic efficiency of the combinatorial clock auction"
    - "on the efficiency of all pay mechanisms"
    - "learning and efficiency in games with dynamic population"
    - "no regret learning in bayesian games"

Connected through hyperedge HE-4 (induced by source paper "efficiency and complexity of price competition among single product vendors"):
  with members:
    - "budgetary effects on pricing equilibrium in online markets"
    - "price competition in networked markets how do monopolies impact social welfare"
    - "the pricing war continues on competitive multi item pricing"
    - "enforcing efficient equilibria in network design games via subsidies"
    - "the cost of stability in coalitional games"
    - "a new multilayered pcp and the hardness of hypergraph vertex cover"

Connected through hyperedge HE-5 (induced by source paper "budgetary effects on pricing equilibrium in online markets"):
  with members:
    - "convergence of tâtonnement in fisher markets"
    - "the pricing war continues on competitive multi item pricing"
    - "on the efficiency of the walrasian mechanism"
    - "ascending auctions and walrasian equilibrium"
    - "combinatorial auctions with decreasing marginal utilities"

Connected through hyperedge HE-6 (induced by source paper "price competition fluctuations and welfare guarantees"):
  with members:
    - "convergence to equilibrium of logit dynamics for strategic games"
    - "logit dynamics with concurrent updates for local interaction games"
    - "composable and efficient mechanisms"
    - "metastability of potential games"
    - "metastability of logit dynamics for coordination games"
    - "mixing time and stationary expected social welfare of logit dynamics"

Connected through hyperedge HE-7 (induced by source paper "price competition in networked markets how do monopolies impact social welfare"):
  with members:
    - "network cournot competition"
    - "price competition fluctuations and welfare guarantees"
    - "the pricing war continues on competitive multi item pricing"
    - "on the efficiency of the walrasian mechanism"
    - "non price equilibria in markets of discrete goods"

Connected through hyperedge HE-8 (induced by source paper "the pricing war continues on competitive multi item pricing"):
  with members:
    - "approximate revenue maximization with multiple items"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.GT(Computer Science and Game Theory)