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ZERO-ANCHOR DOMINANCE + THE HONEST BOUNDARY
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Transient real divergences (both partners hold a common anchor, gaps revert):
      2022 spike (6pp,2y): zero-anchor distortion -0.00%
       Japan era (3pp,17y): zero-anchor distortion +0.00%
            tail (12pp,2y): zero-anchor distortion +0.00%

Common NONZERO anchor (+2%) under the same divergences: ~-5.77% (permanent wedge
from the deflation-buffer asymmetry) -- zero strictly dominates.

The honest boundary -- PERMANENT level split (a partner abandons the anchor):
  +1pp permanent: distortion +1.00% (proportional, real)
  +2pp permanent: distortion +2.00% (proportional, real)
  +3pp permanent: distortion +3.00% (proportional, real)

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VERDICT
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 This VINDICATES Paper 7 against real shocks, with one honest boundary stated.

 1. The zero common anchor absorbs every TRANSIENT real divergence history produced
    -- the 2022 ~6pp spike, the 2021 gap, even Japan's ~17-year deflation gap -- with
    a terminal real-rate distortion of ~0%, because transient deviations around a
    common zero re-converge. This is stronger than the original replication, which
    only swept abstract shock variances <=2%; the real divergences are larger and
    the anchor still absorbs them.

 2. A common POSITIVE anchor (+2%) leaves a structural ~-5.77% wedge regardless of
    the divergence, confirming the paper's "only zero is fully robust" result against
    real magnitudes (the deflation-buffer asymmetry).

 3. THE HONEST BOUNDARY: robustness is to transient divergence, not to a PERMANENT
    level split. If a partner abandons the anchor and runs +k pp forever, the residual
    is ~+k% -- proportional and real. So the anchor's robustness rests on the COMMITMENT
    holding (a governance property), not on immunity to any divergence. Real history is
    the transient kind; a permanent unilateral exit is the failure mode, and it is the
    same capture/override risk catalogued for the domestic rule.

 BOTTOM LINE: against the inflation divergences the world has actually delivered, the
 zero common anchor holds -- the residuals wash out where the original test could only
 show robustness to assumed shocks. The unchanged caveat is that this assumes the
 common-anchor commitment is honored; a permanent unilateral split is a governance
 failure, not a mechanism the anchor neutralizes.

