2012年-IMF国际货币组织全球_What_Drives_the_POLONIA_Spread_in_Poland__19页_1mb

Summary of "What Drives the POLONIA Spread in Poland?"

Core Content

This paper investigates the factors influencing the POLONIA spread—the difference between the Polish Overnight Index Average (POLONIA) and the policy rate—between January 2008 and December 2011. It focuses on the effectiveness of the National Bank of Poland (NBP) in influencing the interbank rate through open market operations (OMOs) and examines the role of liquidity supply and demand, external market sentiment, and the structure of the interbank market.

Main Points

• POLONIA and Policy Rate Relationship: Since the 2008–09 financial crisis, the POLONIA has consistently remained below the policy rate, indicating a limited impact of the NBP's OMOs on the interbank rate.
• Liquidity Supply:
  • The NBP's FX purchases from the Ministry of Finance (MOF) increase structural liquidity, which may widen the spread when it is negative and have no significant effect when it is positive.
  • Regular fine-tuning operations, which absorb liquidity, have been effective in narrowing the spread and reducing its volatility.
  • Repo operations inject liquidity into the market and are expected to reduce the spread when it is positive but have a limited effect when it is negative.
• Liquidity Demand:
  • Banks tend to underbid NBP bill auctions, especially during periods of perceived liquidity stress, which is associated with a wider negative spread.
  • Frontloading of reserve requirements—banks depositing excess liquidity at the beginning of the reserve maintenance period—tightens the liquidity situation, leading to a smaller negative spread or a larger positive spread.
  • As the maintenance period ends, excess liquidity is released, causing the POLONIA to fall further below the policy rate.
• External Factors:
  • The Polish banking system is closely linked to the euro area, and global market sentiment can influence the interbank rate.
  • The EURIBOR-OIS spread serves as a proxy for euro interbank market stress and is associated with tighter liquidity conditions in Poland.
• Structure of the Interbank Market:
  • The interbank market in Poland is underdeveloped, with limited repo trading compared to the unsecured market.
  • The unsecured interbank market dominates, with overnight lending accounting for about 90% of transactions.
  • Increased credit risk in the interbank market leads to liquidity hoarding and a wider negative spread or narrower positive spread.

Key Findings

• The POLONIA spread exhibits autoregressive persistence, with a long-run mean of -0.32 percentage points and an unconditional variance of 0.46.
• The persistence of variance is 0.92, indicating that volatility tends to cluster and last for extended periods.
• The GARCH model is used to analyze the spread, confirming volatility clustering and the presence of fat tails in the distribution of the spread.
• The degree of freedom for the error term is estimated at 2.6, suggesting that the spread is more volatile than a normal distribution would imply.
• The empirical results support the hypothesis that:
  • Liquidity supply (e.g., FX purchases and repo operations) affects the spread, with FX purchases widening the spread when it is negative and repo operations reducing it when it is positive.
  • Liquidity demand (e.g., underbidding and frontloading) is associated with a wider negative spread and increased volatility.
  • External factors (e.g., EURIBOR-OIS spread) influence the spread, especially in times of market stress.
  • Credit risk in the interbank market leads to liquidity hoarding and affects the spread direction.

Policy Implications

• The NBP's use of repo operations and fine-tuning operations has been effective in steering the POLONIA rate closer to the policy rate, particularly in the last few days of the reserve maintenance period.
• However, the persistently negative spread suggests that the monetary policy transmission mechanism may have been weakened.
• The NBP has limited control over some external factors, such as global market sentiment, which can affect liquidity conditions in the interbank market.
• To improve the effectiveness of monetary policy, the NBP should consider enhancing the development of the interbank repo market and improving liquidity management practices in the banking system.

Summary of Predicted Impacts

Conclusion

The analysis highlights that the POLONIA spread is influenced by a combination of internal and external factors, with structural liquidity and liquidity demand playing a central role. The NBP's responses to liquidity imbalances have been effective in some aspects, but the persistently negative spread indicates that the monetary policy transmission mechanism remains imperfect. Further development of the interbank market and improved liquidity management are necessary to enhance the effectiveness of monetary policy in Poland.