Globalization, Divergence and Stagnation



Consider now the case of imperfect protection of IPRs in S, (θ = 0).

.l∕<ι.n,φ) U + θYs


Ln {f [a (i) Φn(i)]σ di}   + θLs ^J [a (i) φs(i)]σ di}

s.t.


J <'n (i) di


the FOCs for a maximum are, i [0,1]:


,                              x 1-σ

Ln {ʃɪ [a (i) Φn(i)]σ di} σ [a (i) Φn(i)]σ-1 Φn(i)+

1 —σ

θls {∕o1 [a (i) φs(i)]<7 di} σ [a (i) φs(i)]<7-1 φs(i) = λ

where λ is the lagrange multiplier associated to the constraint. Using (9) and solving
for
a (i):


a (i) =


/,■,'■,'■"/....■....'■....'
βλ


1(1-σ)


Comparing this condition with equation (16) in the text shows that the sectoral
distribution of the endogenous technology maximizes a weighted sum of Northern
and Southern aggregate output, with a weight of θ on the South. As
Ln/ (θLs) 0,
technologies maximize
ws, whereas as Ln/ (θLs) → ∞ they maximize Wn


5.2 Properties of the wage ratio in autarky


To show that the North-South wage ratio in autarky is bounded by max Φn (i) ∕φs (i) =
Φn (0) φs (0), first note that ∂ω∕∂φN (i) > 0 and ∂ω∕∂φs (i) < 0. Therefore, by con-
struction:


Jo1 Φn (i)J/(1-a) di

Jo‘ Φn    '       Φs (≈)σ di


!,; Φn»V11 σ'd,     1l'''" = Φn(0)

ʃ,1 Φn ''      ' Φs (0)σ di]        φs(0)


5.3 The growth rate under free-trade


Rewrite the marginal condition for buying innovation in a Northern sector as:


WnΦn (i) LnAn (i)σ 1 =

β Jo An (J)σ d7    = Г


34




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