Fill in the blank with appropriate alternatives given below
Introduction of __________ removed difficulties of barter.
Introduction of money removed difficulties of barter.
Explanation: Barter system had many difficulties like the problem of double co-incidence, common measure of value, the problem of standard method of deferred payment etc. which were solved by the introduction of money. Money has overcome the drawbacks of the barter system and serves as an effective medium of exchange to facilitate trade.