I believe that most employment contracts do provide for the terms of employment to be varied from time to time
Yes, but only following mutual agreement, as with all contracts, and not unilaterally. Of course, the employer has the upper hand, as the oft-implied result of rejection tends to be unemployment (even though it cannot actually be).
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Yes, but only following mutual agreement, as with all contracts, and not unilaterally. Of course, the employer has the upper hand, as the oft-implied result of rejection tends to be unemployment (even though it cannot actually be).