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The BOJ Reaction Function

Reading the BOJ as a slogan machine is how desks get trapped. The reaction function runs through wages, services inflation, real rates, and the credibility of communication.

Updated Aug 09, 20261 min read

Chapter 05 · The Yen Carry Bible · v1.0 Beyond slogans Reading the BOJ as a slogan machine is how desks get trapped. The reaction function runs through wages, services inflation, real rates, and the credibility of communication. A shift in expected Japanese real rates reprices the entire funding stack — even if the policy rate move looks 'small' in absolute terms. Wages, inflation, real rates A shift in expected Japanese real rates reprices the entire funding stack — even if the policy rate move looks 'small' in absolute terms. Communication and credibility Communication regimes matter: guidance, YCC history, and the market's belief about what the BOJ will tolerate in FX and inflation determine hedging behavior

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