Income is conventionally denoted by "Y" in economics. John Hicks made use of "I" for income, but Keynes wrote to him in 1937, "just after hoping both of those, I think it is actually much easier to use Y for income And that i for expenditure. Last but not least, https://fummelincomestreams46746.thekatyblog.com/33906695/5-simple-techniques-for-fummel-income-streams