Keywords :
Equilibrium Problem with Equilibrium Constraints; Mobility service providers interacting strategies; Multi-modal user equilibrium; Variational Inequality Problem; Equilibrium constraint; Equilibrium problem; Equilibrium problem with equilibrium constraint; Mobility service; Mobility service provider interacting strategy; Multi-modal; Service provider; User equilibrium; Variational inequality problems; Civil and Structural Engineering; Automotive Engineering; Transportation; Management Science and Operations Research; Equilibrium Problem with Equilibrium; Constraints
Abstract :
[en] In this paper, we analyse the interactions between Mobility Service Providers (MSP) in a multi-modal system. We formulate the problem using a bi-level structure extending Multi-modal Network Design (MND) principles. The upper level models the profit maximization objectives of multiple MSPs operating and offering different services to the users. At the lower level, users are divided into heterogeneous classes based on their travel characteristics, and assigned to a multi-modal super-network characterized by non-separable cost functions to account for interactions between modes. The problem is formulated as an Equilibrium Problem with Equilibrium Constraints (EPEC), which is characterized by a Variational Inequality (VI) Problem at the lower level, and a Nash equilibrium condition at the upper level. We apply an iterative solution algorithm that combines the classical Diagonalization method with an adaptive Extragradient Method to solve this complex problem and test it on several examples, demonstrating the validity and interpretability of the model and its results. These computations illustrate the competitive landscape faced by MSPs and the ranges of solutions where MSPs can be profitable, for small and medium sized examples.
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