Responsa for Bava Metzia 151:1

אם בעל הבית חוזר בו ידו על התחתונה כל המשנה ידו על התחתונה וכל החוזר בו ידו על התחתונה

IF THE EMPLOYER RETRACTS, HE IS AT A DISADVANTAGE.<span class="x" onmousemove="('comment',' Thus, in the first instance, if labour costs increased after they retracted, the employer may deduct the increase that he will have to pay from the wages due for the work already done. If, on the other hand, they decrease, the profit is the employer's, and the workers cannot demand the whole sum originally agreed upon less the (diminished) cost of completing the work. In the second instance, the employer must pay his workmen for what they have already done pro rata even if labour costs advance, and he must pay more for the rest. Should they decrease, however, he is bound to pay the whole sum originally agreed upon less only the diminished cost of the rest. ');">¹</span>

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