Outsourcing, Complementary Innovations and Growth



giving operating profits of

"■ = (1 - ω)psys,


(10)


and the remaining share ω goes to the intermediate supplier. The latter must decide in the previous


stage how much input xm to produce anticipating this share, which incurs a cost of xm units of


labor. Therefore, it maximizes


ʌ m = ωpsys Xm,


(11)


which implies an intermediate and final output equal to


1

Xm = ys = A (αω)


(12)


with associated final price


1

ps = —.


(13)


Using these results in (10) and (11), and recalling that specialized intermediate and final entrants


face probabilities η (r) and η (r) /r of being matched, their expected profits are respectively:


Q
πS = η(r) (1 ω) A (αω) 1 q


(14)


and


πem = (1 a) η^ ^ ωA () 1 q .
r


(15)


Substituting (8) and (13) into (3) and (5) allows us to write aggregate demand as


(16)


where υ is the number of vertically integrated firms and f is the number of matched pairs of spe-


cialized producers that are active at time t.


3.2 Innovât ion


In the entry stage, the output from the R&D labs determines the laws of motion of υ and f. For
vertically integrated firms, we have

v = E⅛ δυ                              (17)

kv


11




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