Liquidity costs and tiering in large-value payment systems
This paper develops and simulates a model of the emergence of networks in an interbank, RTGS payment system. A number of banks, faced with random streams of payment orders, choose whether to link directly to the payment system, or to use a correspondent bank. Settling payments directly on the system imposes liquidity costs which depend on the maximum liquidity overdraft incurred during the day. On the other hand, using a correspondent entails paying a flat fee, charged by the correspondent to recoup liquidity costs and to extract a profit. We specify a protocol whereby one bank in each period can revisit its choice whether to link directly to the system, or to become clients of other banks, thus generating a dynamic client-correspondent network. We simulate this protocol, observing the emergence of different network structures. The liquidity pricing regime chosen by a central bank is found to affect the tiering process and the network structures it produces. A calibration exercise on data from the UK CHAPS system suggests that the model is able to generate realistic predictions, ie a network topology similar to that observed in reality, driven solely by the underlying pattern of payments and the structure of liquidity costs.
|Date of creation:||29 Jul 2010|
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- Soramäki, Kimmo & Bech, Morten L. & Arnold, Jeffrey & Glass, Robert J. & Beyeler, Walter E., 2007. "The topology of interbank payment flows," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 379(1), pages 317-333.
- James Chapman & Jonathan Chiu & Miguel Molico, 2013. "A Model of Tiered Settlement Networks," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 45(2-3), pages 327-347, March.
- Becher, Christopher & Millard, Stephen & SoramÃÂÃÂ¤ki, Kimmo, 2008. "The network topology of CHAPS Sterling," Bank of England working papers 355, Bank of England.
- Alexandra Lai & Nikil Chande & Sean O'Connor, 2006. "Credit in a Tiered Payments System," Staff Working Papers 06-36, Bank of Canada.
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