Compare the USA's at-will employment system, where, since an employee can leave a job for any reason, in turn an employer can terminate the employment for any reason.
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any hiring is presumed to be "at will"; that is, the employer is free to discharge individuals "for good cause, or bad cause, or no cause at all," and the employee is equally free to quit, strike, or otherwise cease work.
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http://en.wikipedia.org/wiki/At-will_employment