Abstract
A linear influence network is a broadly applicable conceptual framework in risk management. It has important applications in computer and network security. Prior work on linear influence networks targeting those risk management applications have been focused on equilibrium analysis in a static, one-shot setting. Furthermore, the underlying network environment is also assumed to be deterministic.
In this paper, we lift those two assumptions and consider a formulation where the network environment is stochastic and time-varying. In particular, we study the stochastic behavior of the well-known best response dynamics. Specifically, we give interpretable and easily verifiable sufficient conditions under which we establish the existence and uniqueness of as well as convergence (with exponential convergence rate) to a stationary distribution of the corresponding Markov chains.
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- 1.
If \(x < 0\), we set \(V_i(x) = -\infty \), representing the fact that negative effective investment is unacceptable.
- 2.
Note that here we do not impose any bounds on the maximum possible investment by any player. If one makes such an assumption, then \(\mathcal {X}\) will be some compact subset of \(\mathbf {R}^N_+\). All the results discussed in this section will still go through. For space limitation, we will not discuss the bounded investment case. Further, note that the unbounded investment case (i.e. without placing any exogenous bound on investments made by any player) which we focus on here is the hardest case.
- 3.
As we shall soon see, the two norms we will be using are weighted \(l_1\) norm and weighted \(l_{\infty }\) norm.
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- 5.
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Zhou, Z., Bambos, N., Glynn, P. (2016). Dynamics on Linear Influence Network Games Under Stochastic Environments. In: Zhu, Q., Alpcan, T., Panaousis, E., Tambe, M., Casey, W. (eds) Decision and Game Theory for Security. GameSec 2016. Lecture Notes in Computer Science(), vol 9996. Springer, Cham. https://doi.org/10.1007/978-3-319-47413-7_7
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DOI: https://doi.org/10.1007/978-3-319-47413-7_7
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