This is not what the word "fungible" means. Not at all. Dollars are fungible. You can replace any $1 bill with any other and it doesn't matter. Calling trading

This is not what the word "fungible" means. Not at all. Dollars are fungible. You can replace any $1 bill with any other and it doesn't matter. Calling trading X for Y where calculations of comparable value have to occur is exactly the opposite of fungible.