Income is conventionally denoted by "Y" in economics. John Hicks utilized "I" for income, but Keynes wrote to him in 1937, "immediately after striving the two, I believe it is easier to use Y for income And that i for expense. Illustrations are automatically compiled from on the internet resources https://fummel-income-streams37967.boyblogguide.com/34224866/the-ultimate-guide-to-fummel-income-streams