if you are interested in the issue of unequal exchange at all, have a look
at my new working paper, entitled:
"Unequal Exchange 1965-1995: World Trend and World Tables"
in the wsn archive, working papers section.
the address is
http://csf.colorado.edu/wsystems/archive/papers/kohler/kohler3.htm
thanks to professor chase-dunn & team for putting it up.
Highlights: Amin's estimate corroborated. Why Marx didn't have to worry
about unequal exchange. Unequal exchange increased significantly between
1965 and 1995, both in absolute and relative terms.
-gk