century．The tII∞巧f砘us船on
the
heterogeneous fi珊B in intematjonal tmde and
go酷de印ly
int0 tlle fim—leVel昀de
data，di雎ring f南m tlle neo—cl舾sical mlde tIIeofy蛐d the new_仃ade—tlleory which f＆us∞inte卜industry trade蛐d
inm卜industry缸ade．The heterogen∞us fi皿s vary
in
productivity
level．The new—new州e tlleory，thlough
tIle
setting—up
of mlde model彻d endogen叫s boundary
model
f打hetemgeneous fims，explains why oIlly
a smaU p矾of fims exp嘣
卸d make FDI in the whole industry，粕d reVeals the contribution of
export
to
economic铲owth
fbm a brand new
perspective
The
endogenous b叫ndary modelincorporat鹤inc啪plete contr∞t andpmpe州ghts model into staIld捌tmde model粕d
既plains tIle
pattem8
0f intra_fi珊删e．
Key words：he￡erog朗eous fi珊；p删uctiVjt)，；export；ndogenous boundary；FDI 8
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万方数据