Abstract
We study a market of investments on networks, where each agent (vertex) can invest in any enterprise linked to her, and at the same time, raise capital for her firm's enterprise from other agents she is linked to. Failing to raise sufficient capital results with the firm defaulting, being unable to invest in others. Our main objective is to examine the role of collateral contracts in handling the strategic risk that can propagate to a systemic risk throughout the network in a cascade of defaults. We take a mechanism-design approach and solve for the optimal scheme of collateral contracts that capital raisers offer their investors. These contracts aim at sustaining the efficient level of investment as a unique Nash equilibrium, while minimizing the total collateral. Our main results contrast the network environment with its non-network counterpart (where the sets of investors and capital raisers are disjoint). We show that for acyclic investment networks, the network environment does not necessitate any additional collaterals, and systemic risk can be fully handled by optimal bilateral collateral contracts between capital raisers and their investors. This is, unfortunately, not the case for cyclic investment networks. We show that bilateral contracting will not suffice to resolve systemic risk, and the market will need an external entity to design a global collateral scheme for all capital raisers. Furthermore, the minimum total collateral that will sustain the efficient level of investment as a unique equilibrium may be arbitrarily higher, even in simple cyclic investment networks, compared with the corresponding non-network environment. Additionally, we prove computational-complexity results, both for a single enterprise and for networks.
Original language | English |
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Title of host publication | WWW 2022 - Proceedings of the ACM Web Conference 2022 |
Publisher | Association for Computing Machinery, Inc |
Pages | 79-89 |
Number of pages | 11 |
ISBN (Electronic) | 9781450390965 |
DOIs | |
State | Published - 25 Apr 2022 |
Externally published | Yes |
Event | 31st ACM World Wide Web Conference, WWW 2022 - Virtual, Online, France Duration: 25 Apr 2022 → 29 Apr 2022 |
Publication series
Name | WWW 2022 - Proceedings of the ACM Web Conference 2022 |
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Conference
Conference | 31st ACM World Wide Web Conference, WWW 2022 |
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Country/Territory | France |
City | Virtual, Online |
Period | 25/04/22 → 29/04/22 |
Bibliographical note
Publisher Copyright:© 2022 ACM.
Keywords
- Financial Networks
- Investment
- Mechanism Design
- Strategic Risk