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A Network View on Interbank Liquidity 1 Co-Pierre Georg University of Cape Town and Deutsche Bundesbank 1 Joint work with Silvia Gabrieli (Banque de France). Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 1 / 12

  1. A Network View on Interbank Liquidity 1 Co-Pierre Georg University of Cape Town and Deutsche Bundesbank 1 Joint work with Silvia Gabrieli (Banque de France). Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 1 / 12

  2. Introduction Interbank markets are . . . . . . the major source of funding liquidity for euro area banks ⇒ Functioning interbank market crucial for financial stability . . . first intermediary market in the implementation of monetary policy ⇒ Market disruptions can have real economic consequences Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 2 / 12

  3. Introduction Interbank markets are . . . . . . the major source of funding liquidity for euro area banks ⇒ Functioning interbank market crucial for financial stability . . . first intermediary market in the implementation of monetary policy ⇒ Market disruptions can have real economic consequences How did the Lehman event affect unsecured interbank lending in the euro area? Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 2 / 12

  4. A Market Freeze in the Euroarea Interbank Market? Figure: The Libor-OIS and Ted spread, measuring risk premia in the interbank market Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 3 / 12

  5. Studying market freeze with payment system data Increase in risk premia is indication of market freeze Corresponding drop in volume in theory due to asymmetric information or precautionary liquidity hoarding ⇒ Remedy: provide bank capital and liquidity Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 4 / 12

  6. Studying market freeze with payment system data Increase in risk premia is indication of market freeze Corresponding drop in volume in theory due to asymmetric information or precautionary liquidity hoarding ⇒ Remedy: provide bank capital and liquidity Payment system data allow more detailed view TARGET2 settles ≥ 90% of all transactions between all European banks Unparalleled precision of data on unsecured interbank loans Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 4 / 12

  7. Lending volumes increased after Lehman event and decreased after ESCB intervention 200 Total daily turnover [billion Euro] 150 100 50 0 07/04/08 07/21 07/04/08 07/21 07/04/08 07/21 07/04/08 07/21 07/04/08 07/21 07/04/08 07/21 07/04/08 07/21 07/04/08 08/29 08/29 08/29 08/29 08/29 08/29 09/15 09/29 09/15 09/29 09/15 09/29 09/15 09/29 09/15 10/15 10/15 10/15 11/08 11/08 12/01 Date 1 year 3 month 1 week Overnight Figure: Normalized volume of the euro area overnight and term interbank market. Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 5 / 12

  8. Prices remained stable, but price dispersion increased in the overnight segment after Lehman event 6 Rate in percentage points 5 4 3 07/04/08 07/21 07/04/08 07/21 07/04/08 07/21 07/04/08 07/21 07/04/08 07/21 07/04/08 07/21 07/04/08 07/21 07/04/08 08/29 08/29 08/29 08/29 08/29 08/29 09/15 09/29 09/15 09/29 09/15 09/29 09/15 09/29 09/15 10/15 10/15 10/15 11/08 11/08 12/01 Date EONIA Deposit facility rate ON Rate (smoothed) 1yr Rate (smoothed) Figure: Daily price of liquidity in the euro area overnight and term interbank market. Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 6 / 12

  9. Cross-sectional variance in access to liquidity Our analysis shows signs of counterparty risk concerns in the overnight segment two weeks before Lehman event After Lehman event, banks engage in maturity shortening (largely) irrespective of counterparty risk Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 7 / 12

  10. Cross-sectional variance in access to liquidity Our analysis shows signs of counterparty risk concerns in the overnight segment two weeks before Lehman event After Lehman event, banks engage in maturity shortening (largely) irrespective of counterparty risk The fact that the aggregate price for liquidity remained constant after Lehman event masks a large heterogeneity in banks’ access to liquidity Heterogeneity is revealed when studying the interbank network structure More than half of all bilateral lending relationships change from pre- to post-Lehman period ⇒ Consequences of this structural change? Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 7 / 12

  11. Simple Intuition why Betweenness Centrality Matters Figure: Sample interbank network. Each node is a bank, each link is an interbank loan. Balance sheet of borrower B is identical in both situations. Network position can be measured e.g. through betweenness centrality. Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 8 / 12

  12. Higher centrality implies more bargaining power Main Hypothesis : Banks with higher betweenness centrality make larger intermediation spreads Intermediation in networks through bilateral and multilateral bargaining Betweenness centrality ⇐ ⇒ Bargaining power Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 9 / 12

  13. Higher centrality implies more bargaining power Main Hypothesis : Banks with higher betweenness centrality make larger intermediation spreads Intermediation in networks through bilateral and multilateral bargaining Betweenness centrality ⇐ ⇒ Bargaining power Supporting Hypotheses Banks with higher betweenness centrality obtain and provide more liquidity during times of distress Banks with higher betweenness centrality pay a lower price on their interbank borrowing Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 9 / 12

  14. Detailed data allow unbiased identification Use loan-level regressions controlling for demand Simplified bank balance sheet D i , t + B i , t = L ij , t Diff-in-diff setup with restriction on banks that borrow from at least two lenders controlling for borrower fixed-effects: ∆ L ij = β j + β 1 ∆ D i + ǫ ij (1) Access to interbank deposits D i ≡ α Network Position i And similar for extensive margin Crucial for identification: unanticipated interbank deposit shock Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 10 / 12

  15. Interbank network structure affects pricing of loans Support of Main Hypothesis Intermediation spread in pre-Lehman period: ∼ 90bp Banks that experience one standard deviation increase in betweenness centrality increase intermediation spread by ∼ 30bp In line with experimental evidence on trading in networks Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 11 / 12

  16. Interbank network structure affects pricing of loans Support of Main Hypothesis Intermediation spread in pre-Lehman period: ∼ 90bp Banks that experience one standard deviation increase in betweenness centrality increase intermediation spread by ∼ 30bp In line with experimental evidence on trading in networks Supporting Hypotheses 10% increase in betweenness ↔ 3 . 5% more borrowing (bank-level) 10% increase in betweenness ↔ 9% more lending (bank-level) 10% increase in betweenness ↔ 3 . 5% lower spread Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 11 / 12

  17. Discussion and Conclusion Extensive liquidity supply by the ESCB following Lehman event substituted part of the euro area overnight interbank market The resulting change in interbank network structure reduced bargaining power of betweenness central banks Betweenness central banks make smaller intermediation spreads, which affects their profitability Our paper relates the global structure of the interbank network with local liquidity re-allocation Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 12 / 12

  18. Discussion and Conclusion Extensive liquidity supply by the ESCB following Lehman event substituted part of the euro area overnight interbank market The resulting change in interbank network structure reduced bargaining power of betweenness central banks Betweenness central banks make smaller intermediation spreads, which affects their profitability Our paper relates the global structure of the interbank network with local liquidity re-allocation Thank you! Co-Pierre Georg (UCT & Bundesbank) A Network View on Interbank Liquidity 12 / 12

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