The agriculture of india was very important, farmers would sow wheat, and barley for large sums of money.
India was broken up into a social caste system which ranked people based on their ancestors caste. Once you were in a caste, you would not be able to get out.
Trade was vital for early Rome because in order to upkeep Rome’s expensive costs, it was necessary to get large sums of money from trade. Mare Nostrum made it so that the Romans had to share these waters with Italy so because Italy was apparently the successor to the Roman Empire.