Separate question. I was responding to a question about the value of things as measured in currency.

$1 is worth $1, tautologically. If you happen to believe $1 has no worth, just send me all your dollars. I can use them. I'll send you a loaf of bread, which you can eat to sustain life.

Nearly everyone believes $1 is worth something so it's not in my interest to give you $1, particularly with a snarky response like that. Dollars are not actually a measure of any physical thing, unlike metres or whatever. They represent what we perceive as worth. That only exists in our heads.