Contracts include unbounded variables all the time. Banks offer accounts with “whatever we feel like” interest rates. Bonds can have “whatever we feel like” in

Contracts include unbounded variables all the time. Banks offer accounts with “whatever we feel like” interest rates. Bonds can have “whatever we feel like” interest rates. Stocks can have “whatever we feel like” dividends. Short term rentals have “whatever we feel like” rental prices. In practice, the payer offers a very short term guarantee: “for the next pay period, you will get $50 an hour”, but after that pay period they change it. There are contracts behind all these things. One party offers something on a continuous basis: labor, money, etc. The other party walks away when they don’t like what they’re getting.