Definitions of Terms of Trade

Commodity terms of trade =Ppc/Pmf
Double factoral terms of trade =(Px/Pm)*(Ax/Am)
Gross barter terms of trade =(Qm/Qx)
Income terms of trade =PxQx/Pm
Net barter terms of trade =(Px/Pm)
Single factoral terms of trade =(Px/Pm)*Ax
 
where:
Ax =Factor productivity of imports
Am =Factor productivity of exports
Qm =Quantity of imports
Pm =Price of imports
Pmf =Price of manufactures
Ppc =Price of primary commodities
Px =Price of exports
Qx =Quantity of exports