Most American workers are hired "at will": Employers owe their employees nothing in the relationship except earned wages, and employees are at liberty to quit at their option. As the rule is generally stated, either party may terminate the arrangement at any time for a good or bad reason or none at all. In keeping with that no-strings-attached spirit, employees may move on as they see fit – unless they happen to be among the tens of millions of workers bound by a contract that explicitly forbids getting hired by a competitor.