The Impact of Optimal Tariffs and Taxes on Agglomeration



dT

Hr1


Y α - Г)Рσ 1 (1σT' + 1-τ, (σ - P-(1 ^θ) ' ɑ2*1

Substituting (12.6)-(12.8) in (12.5) yields:

σP1-σ

+(1 -


*γ (1 -Ti )


+ σT1 1+T1)


(1-LTf

1-ti


Pσ-1 [σP *1-σT * Y (1 L)]


σ γ) (σLP*1-σT* + γ(ΘΘ* 1)(1 L)L) = 0.


(12.9)


If both, tax rate and tariff, are chosen to optimize welfare (12.4) and (12.9)
must be solved simultaneously for
Ti and TA:

TI,Opt

TA,Opt


σP *ι-σ t * γ (1 L) γLΘ*
σ2P*1-σT* γσ(1-L) γLΘ*,

(12)


.

σ

Resubstituting φ and T from (3) and (7) and simplifying yields:

(1L) (Y(σ1) + σ(1Y)(1tA))+Lθ* fσ(1Y)⅛+Y(σl)ɔ

Ti =-------------------------------------w---------f~t--------⅛ > 0,

(1 — L)σ (γ(σ1)(1γ)(1 — t*))+Lθ* (^σσ(1γ)l-TA+γ(σ2 1)J

which is positive as long as γ < 1 < σ.

Optimal taxes and tariffs under coop., eqs. (14,15):

The partial derivatives of the the overall welfare (13) with respect to domestic
taxes and tariffs are given by:

L—-Y
dTι


— + γTP-1
dTι + y


dP
dT
I


ι(1 T*)1-γ P*T      dw* _ 0

b(1 Ta)1-γ P-γT*(     dTι     ,


(14.1)


L^W +Y(1Y) (1 T (1 Ta)-i) + <1T*P*^T (1L)dW*
dTA          ' V             (1 Ta)1-γ P-yT*V ,drAA

0. (14.2)


22



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