The Banjaras were trader-nomads who bought grain where it was cheaply available and carried out to places where it was dearer.
They played an important role in transporting grain to the city markets.
They are economically important because all the trades are under the controlled of them.
Final Answer:
Banjaras are the important trade – nomad who bought the grain from markets where it was cheaply available and sold out grain where it was dearer.