公司可以没有理由地解聘员工,与楼主所说的随意减少合约工资无关。
At-will employment is a term used in U.S. labor law for contractual relationships in which an employee can be dismissed by an employer for any reason (that is, without having to establish "just cause" for termination), and without warning, as long as the reason is not illegal (e.g. firing because of the employee's race or religion).
(维基上抄过来的)