Substituting for the average firm output yields,
sbt
_____
Wct + ψ (
_______pdy_______
pdy + (1 — ψ)pf mf
ybt
pfmf PαN (wfam) p
+------------------(----------ь-----------------
pdy + (1 - ψ)pfmf αN (wfamy-ρ + am
+ pbtf
- pbtd))
/ʃ ∖P-1
Pam f am) ʌ
---------ʃ X--W1
Un + am(wf am )ρ-1
- pt
- ybt .
(40)
Collecting terms,
sbt
(ψ- 1)( pdy + pf mf
pdy + (1 — ψ)pf mf
. ψpfmf pan (wfam´ p _ _pam(wfjaNmy_)c
+ 1 + pdy +(1 - ψ)pfmf an (wf am´1-ρ + am aN + am(wfam)ρ-1 ^t
+(—
ψpf mf
pdy +(1 - ψ)pf mf
Pan wfa√) p
an (wf On) p + a
(41)
ρam (wfɑm ´ ψpfmf f
--+---ʃ------X-----T + ---T--------',----------X---ʃ----) Ip +
aN + am(wf am )ρ-1 pdy + (1 — ψ)pf mf
aN
+ ψpf mf pd
pdy + (1 — ψ)pf mf
Substituting this into the Phillips curve yields,
βa p ^d . ω^d . (1 - ω)(1 - a)(1 - aβ)
λ Et t+1 + λ t-1 + (1 + (ψ - 1)θ)λ
(ψ - 1)( pdy + pfmf
pdy + (1 - ψ)pf mf
ybt)
_f / P P 1 1 1 —P
(1 - ρ)pP (wf⅜n) + pfmf__PaN (wfam)
(w + pf (wf am)') + pdy + (1 - ψ)pfmf aN (wf am´1-ρ + am
-,----pfmf . . (b
pdy + (1 - ψ)pf mf
- pbtf ))
This can be rewritten by noting the following relationships. Consider the share
of labour costs relative to labour and intermediate goods costs,
WN
WN + pf mf'
(42)
21
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