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5 Appendix
5.1 Optimality of technologies
Consider first the case of no IPRs protection in S, (θ = 0). Total production in the
North is equal to Yn = WnLn/ β. Using (9):
Max^a^j^yY^ = Ln {ʃ [а (г) Φn(i)]σ di^∙ s.t. J а (г) di = а
The solution to this program has to satisfy the following first order conditions
(FOCs), ∀i ∈ [0,1]:
LN I [a (i) φN(г)Г dij> [a (i) φN(г)Г 1 φN(i) = λ
where λ is the lagrange multiplier associated to the constraint. Taking the ratio of
any two FOCs and using An(i) = а (i) Φn(г) yields equation (13). This proves that
the sectoral profile of the endogenous technology maximizes Northern output and
wage and hence it is optimal for the North.
33
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