liquidity saving mechanisms and bank behaviour
DESCRIPTION
We model a payment system with internal queues and look at how much liquidity/delay a liquidity -saving mechanism could reduce when the behavior of participants is taken into account via a agent-based model.TRANSCRIPT
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Liquidity saving mechanisms andbank behaviour
Marco Galbiati – BoEKimmo Soramäki – VerticeTree
ABM-BaFTorino - 10 February 2009
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Interbank payment systems
Real Time Gross Settlement (RTGS) mode
• Incentives to queue
• ‘Games’ being played on a liquidity/delay tradeoff
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Interbank payment systems
Real Time Gross Settlement (RTGS) mode
• Incentives to queue
• ‘Games’ being played on a liquidity/delay tradeoff
• Pool internal queues!
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Interbank payment systems
Real Time Gross Settlement (RTGS) mode
• Incentives to queue
• ‘Games’ being played on a liquidity/delay tradeoff
Liquidity Saving Mechanisms (LSMs)
• Pool internal queues!
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Aims
1. Model a system with internal queues (LMM)
2. Look at how much liquidity/delay a LSMreduces in theory
3. Look at how banks would use a LSM
An ‘agent-based’ model
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Model of a payment system
• N banks
• A ‘day’ of several ‘seconds’
• Random payment orders random pairs ‘payer&payee’ for each payment a ‘urgency’ parameter u ~ U[0,1]
• Each bank sends payment orders in either of two ‘pipes’(streams): RTGS or Queue
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Low urgency? RTGS
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High urgency? QueueA
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High urgency? QueueA
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End of day Cost = delay cost + liquidity costs
= _ uk • (tk - tk’) + _ • a
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Very low liquidity
% routed to RTGS
costIllustration of costs
Liquidity cost
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Illustration of costs
Delay cost
Very low liquidity
% routed to RTGS
cost
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Total cost
Very low liquidity
% routed to RTGS
Illustration of costsco
st
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Total cost
Very low liquidity
Total cost
Very high liquidity
% routed to RTGS % routed to RTGS
Illustration of costsco
st
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• Banks choose–opening liquidity balance: _–urgency threshold to queue: _
The game
• For each strategy profile (_1, _1), (_2, _2), (_3, _3)… (_N, _N)a payoff (cost) function
• We look at Nash equilibrium for 2 cases:• ‘LMM’ - low urgency payments in internal queues• ‘LSM’ - low urgency payments in central queue
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Agent-based modelling
Liquidity flows very complex
simulate the settlement process
to compute costs,
and hence equilibria
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Agent-based modelling
We look at symmetric equilibria:
{(_1, _1), (_2, _2), (_3, _3)… (_N, _N)} : (_i, _i) = (_j, _j) for each i, j
Liquidity flows very complex
simulate the settlement process
to compute costs,
and hence equilibria
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1Model with internal queues
(LMM)
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Delay costs with LMM
Del
ay c
osts
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Increase “your” threshold
1
Del
ay c
osts
Delay costs with LMM
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2
Increase “your” threshold
Delay costs with LMM
Del
ay c
osts
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3
Increase “your” threshold
Delay costs with LMM
Del
ay c
osts
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4
Increase “your” threshold
Delay costs with LMM
Del
ay c
osts
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5
Increase “your” threshold
Delay costs with LMM
Del
ay c
osts
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Increase “your” threshold
Delay costs with LMM
Del
ay c
osts
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Increase “your” threshold
Delay costs with LMM
Del
ay c
osts
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Increase “your” threshold
Delay costs with LMM
Del
ay c
osts
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9
Increase “your” threshold
Delay costs with LMM
Del
ay c
osts
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Delay costs with LMMsystem level
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Equilibria - LMM
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Equilibria - LMMIncrease liquidity price a
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Equilibria - LMMIncrease liquidity price a
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Equilibria - LMMIncrease liquidity price a
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Equilibria - LMMIncrease liquidity price a
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Equilibria - LMMIncrease liquidity price a
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Equilibria - LMMIncrease liquidity price a
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Equilibria - LMMIncrease liquidity price a
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Cos
tLi
quid
ity
Equil.
* Planner
Too little liquidity,too much queueing
Equilibria - LMM
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2Potential savings from a LSM
(‘LSM mechanics’)
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RTGS + LMM
RTGS + LSM
Savings in liquidity
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All in RTGS All queued
RTGS + LMM
RTGS + LSM
Savings in liquidity
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Savings in delay costs
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3How would banks
use the LSM ?
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Delay costs with LSM
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Increasing “your” threshold
Delay costs with LSM
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UAD
Delay costs with LSMIncreasing “your” threshold
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Delay costs with LSMIncreasing “your” threshold
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Delay costs with LSMIncreasing “your” threshold
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Delay costs with LSMIncreasing “your” threshold
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Delay costs with LSMIncreasing “your” threshold
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Delay costs with LSMIncreasing “your” threshold
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Delay costs with LSMIncreasing “your” threshold
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Delay costs with LSMIncreasing “your” threshold
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_ - equilibria with LSM
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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At high liquidity costthis is the onlyequilibrium
_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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At very highliquidity costplanner andbanks choose thesame
_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
![Page 100: Liquidity saving mechanisms and bank behaviour](https://reader036.vdocuments.mx/reader036/viewer/2022081717/54c422574a7959385e8b4624/html5/thumbnails/100.jpg)
_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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_ - equilibria with LSM
Increase liquidity price
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liquidity
thresh.
costs
LMM vs LSM (good) equilibria
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liquidity
thresh.
costs
LMM vs LSM (good) equilibria
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costs
LMM vs LSM (good) equilibria
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cost ratio
costs
LMM vs LSM (good) equilibria
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LMM vs LSM (bad) equilibria
liquidity
thresh.
costs
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Conclusions
In the hands of a ‘planner’,
LSM can save substantial amounts of liquidity,
and largely improve settlement speed
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Conclusions
In the hands of a ‘planner’,
LSM can save substantial amounts of liquidity,
and largely improve settlement speed(but may require radical choices)
In the hands of individual banks,
LSM may require some ‘coordination device’
to yield its potential benefits
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Conclusions
In the hands of a ‘planner’,
LSM can save substantial amounts of liquidity,
and largely improve settlement speed
In the hands of individual banks,
LSM may require some ‘coordination device’
to yield its potential benefits
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Slide 112
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Slide 113 (!)
~ _ ~
Many thanks