ANSWER: commodity money
EXPLANATION: The commodity money is the hardest to travel with as it does not have any fixed value and has only the value of the commodity for which it is made. The commodity money exchanges commodities such as gold, silver, copper, salt, peppercorns, tea, large stones, decorated belts, shells, alcohol, cigarettes, cannabis, silk, candy, nails, cocoa beans, cowries and barley.
