Under a system of floating exchange rates, changes in the value of the U. S. dollar relative to other currencies are the result of

Intoxicated and not aware of the consequences, umberto agrees to a two-year cell-phone service contract with wander talk, inc., at more than the average market price. this contract is not enforceable because the contract clearly favors wander talk. not enforceable because umberto was intoxicated enough to lack mental capacity when he agreed to it. not enforceable because contracting parties can change their minds. enforceable.