Commodity terms of trade
 =  P_{pc}/P_{mf}

Double factoral terms of trade
 =  (P_{x}/P_{m})*(A_{x}/A_{m})

Gross barter terms of trade
 =  (Q_{m}/Q_{x})

Income terms of trade
 =  P_{x}Q_{x}/P_{m}

Net barter terms of trade
 =  (P_{x}/P_{m})

Single factoral terms of trade
 =  (P_{x}/P_{m})*A_{x}


where:

A_{x}
 =  Factor productivity of imports

A_{m}
 =  Factor productivity of exports

Q_{m}
 =  Quantity of imports

P_{m}
 =  Price of imports

P_{mf}
 =  Price of manufactures

P_{pc}
 =  Price of primary commodities

P_{x}
 =  Price of exports

Q_{x}
 =  Quantity of exports
