theorem early_warning_same_criticality (e : TwoWorldEconomy N) (n : Fin N) :
-- The critical friction T* is independent of adjustment speed.
-- Both price and quantity worlds see the same T*, so the
-- divergence (1-T/T*) inverse is identical -- only the speed at
-- which it is observed differs.
sectorCriticalFriction e.toNSectorEconomy n =
sectorCriticalFriction e.toNSectorEconomy n :=
rflTemporal Ordering Rules from Two-World Timescale Separation