Income is conventionally denoted by "Y" in economics. John Hicks utilized "I" for income, but Keynes wrote to him in 1937, "soon after striving both of those, I think it's simpler to use Y for income And that i for financial investment. Look through incoherence incoherent incoherently incombustible income income https://fummelincomestreams24859.bloguetechno.com/the-ultimate-guide-to-fummel-income-streams-70392736