Further north, the Saurashtra and Bengal coasts played an important role in maritime trade, and the Gangetic plains and the Indus valley housed several centres of river-borne commerce. Most overland trade was carried out via the Khyber Pass connecting the Punjab region with Afghanistan and onward to the Middle East and Central Asia. Although many kingdoms and rulers issued coins, barter was prevalent. Villages paid a portion of their agricultural produce as revenue to the rulers, while their craftsmen received a part of the crops at harvest time for their services.
2007 Human Development Report (HDR), United Nations Development Program, November 27, 2007, p.25. (The report also notes that although India is rising economically, the bad news is that this has not been translated into accelerated progress in cutting under-nutrition. One-half of all rural children [in India] are underweight for their age—roughly the same proportion as in 1992.)
Example. Jean Blanc, a citizen and resident of Canada, is employed as a professional hockey player by a U.S. hockey club. Under Jean's contract, he received $150,000 for 242 days of play during the year. This includes days spent at pre-season training camp, days during the regular season, and playoff game days. Of the 242 days, 194 days were spent performing services in the United States and 48 days performing services in Canada. The amount of U.S. source income is $120,248 ((194 ÷ 242) × $150,000).
For a person working for a wage, their source of income is their job, or their labor (aka their time that they sell to someone). But you can own a house, and rent it out, and when your renters pay you renter every month, the source of that income check is your rental property, or your house. It would just be called rental income. If you have money in the bank in an account that pays interest, those interest payments are another source of income. We can say the source is interest payments, or we can identify the asset that is generating rent, and say your money in the bank that is generating “rent” (aka interest) is your source of income.