Two questions in particular will be addressed. First, can earlier resu
lts for specific industries that suggest a positive relation between q
uality and capital-labour ratios of exporting countries be generalized
to other industries? Second, what type of capital, physical or human,
is most important in affecting the quality of vertically differentiat
ed products? The results suggest that the relation between factor endo
wments and the quality of exported products is not just restricted to
the product groups in previous analyses and that it is primarily human
and not physical capital that determines the quality of production.