A contract-theoretic general equilibrium model is employed to investig
ate the old idea that international competition yields welfare gains b
y reducing internal slack - 'X-inefficiency' - in firms. This popular
notion is partly supported in that trade is is shown to yield welfare
gains by inducing increased supply of a non-contractible factor, which
initially is socially under-supplied. However, it is also shown that
common statements such as 'gains from reduced X-inefficiency' do not s
eem meaningful. Furthermore, contrary to popular belief, trade need no
t benefit the X-inefficient economy more than the X-efficient economy.