NDLI: Clearing Payments in Financial Networks with Credit Default Swaps [Extended Abstract]

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Clearing Payments in Financial Networks with Credit Default Swaps [Extended Abstract]

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Clearing Payments in Financial Networks with Credit Default Swaps [Extended Abstract]

Content Provider	ACM Digital Library
Author	Schuldenzucker, Steffen Seuken, Sven Battiston, Stefano
Abstract	We consider the problem of clearing a system of interconnected banks that have been exposed to a shock on their assets. Due to this shock, some of the banks may go into bankruptcy and default on their obligations towards other banks. Clearing means computing the payments to be made from each bank to each other bank in accordance with bankruptcy law. The design of good clearing mechanisms is challenging because of the complex and often cyclic interdependencies in realistic financial networks. Eisenberg and Noe (2001) showed that when banks can only enter into debt contracts with each other, then there always exists a unique Pareto efficient clearing payment vector and it can be computed in polynomial time. Rogers and Veraart (2013) extended this result to a setting where defaulting banks can only recover part of their assets. In the present paper, we show that the situation changes radically when banks can also enter into credit default swaps (CDSs), i.e., financial derivative contracts that depend on the default of another bank. Extending the models in both abovementioned pieces of work, we first prove that in financial networks with CDSs, a clearing payment vector may not even exist. This implies that the value of a contract may not be well-defined. In other cases, there may be several clearing vectors, none of which is individually preferred by all banks, thus forcing the clearing mechanism to favor one bank over another. On the computational side, we prove that determining whether a clearing vector exists is already NP-hard. We then develop a new analysis framework to derive constraints on the contract space under which these problems are alleviated. Our results can be used to inform the discussion on different policy proposals. We show that routing all contracts via a central counterparty would not even guarantee existence. In contrast, we show that banning "naked" (speculative) CDSs would re-establish an existence guarantee for a unique Pareto efficient clearing payment vector. The full version of this paper is available at http://www.ifi.uzh.ch/ce/publications/Clearing_CDSs.pdf.
Starting Page	759
Ending Page	759
Page Count	1
File Format	PDF
ISBN	9781450339360
DOI	10.1145/2940716.2940791
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2016-07-21
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Clearing systems Financial networks Credit default swaps
Content Type	Text
Resource Type	Article

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