Foreign Direct Investment and the Single Market



Assume therefore that τ falls below 0.5. The first difference from Section 2 is that this
reduces the
absolute profitability of exporting and not just its profitability relative to foreign
direct investment. The total profits from exporting are now:

x = nπ[f,(n-l)τ]                          (26)

Setting this equal to zero, the threshold external tariff t is increasing in τ, and hence it falls
as
τ falls. In words, reducing internal barriers makes exporting less attractive for a new
reason, additional to those already noted in Section 2. Competition from partner-country
firms in each union country is increased, which makes it less profitable for the multinational
to supply any union countries externally. With linear demands, the threshold external tariff
is:

( = l+(n-l)τ                              (27)

n+1

This falls from a maximum of 0.5 when internal and external barriers are equal, to a
minimum of
1/(n+1) when internal barriers are abolished. In Figure 4, the vertical locus
separating the
X and O regions shifts to the left.10

Turn next to the FDI case. As in the previous sub-section, we need to distinguish
between two cases. If
τ is below ⅛, then the multinational faces competition from all other
union firms in every market where it locates. By contrast, if
τ exceeds ½ (while still lying
below
½), then firms from other union countries are not competitive in any market where the
multinational locates. In this case, FDI leads to the multinational behaving like a duopolist,

10 A complication arises with non-linear demands. It is shown in the Appendix that the
derivative of
π with respect to t could be positive if demand is highly convex. This in turn
raises a further possibility that the derivative could change sign as falls in
t alter the curvature
of the demand function. As a result, the
X and O regions could overlap in Figure 4. This
possibility must be considered rather esoteric, and I ignore it henceforward.

15



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