Optimal monetary policy when interest rates are bounded at zero

Ryo Kato, Shinichi Nishiyama

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


This paper characterizes the optimal monetary policy reaction function in the presence of a zero lower bound on the nominal interest rate. We analytically prove and numerically show that the function is highly non-linear, more expansionary, and more aggressive than the Taylor rule. We then test its empirical validity taking the case of Japan in the 1990s. Qualitatively, we find some evidence of non-linear monetary policy. Quantitatively, we find the actual monetary policy to be too contractionary during the first half of the decade, while the low interest policy during the latter half turns out to be fairly consistent with the simulated path.

Original languageEnglish
Pages (from-to)97-133
Number of pages37
JournalJournal of Economic Dynamics and Control
Issue number1-2
Publication statusPublished - 2005 Jan 1


  • Deflation
  • Liquidity trap
  • Pre-emptive monetary policy
  • Zero bound

ASJC Scopus subject areas

  • Economics and Econometrics
  • Control and Optimization
  • Applied Mathematics


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