As long some commodity (X) gains monetary value (demand for X is demand for a medium of exchange) it no longer needs any other value to function. Still I doubt

As long some commodity (X) gains monetary value (demand for X is demand for a medium of exchange) it no longer needs any other value to function. Still I doubt that cans of mackerel have no other use than monetary in prisons. Not many McDonalds around, beside if those were never consumed their supply would be grow continually which will to "mack" inflation. P.S. Have you missed the point about the hot?