Explain with example single n Double factorial terms of trade?

Question

I m BBA student need notes on foreign trade,if u hav got,plz upload them or give me the link.

Answer 1

♦ The single factorial terms of trade - is the net barter terms of trade adjusted for changes in the productivity of exports.

♦ The double factorial terms of trade - adjusts for both the productivity of exports and the productivity of imports.

Can't give you examples though.