Commentary for Menachot 153:11

אלא שמע מינה תלת שמע מינה מנה של קודש כפול היה ושמע מינה מוסיפין על המדות ואין מוסיפין יותר משתות ושמע מינה שתותא מלבר

then [for the same reason] it should not [be permitted to increase] even by a sixth! And if it be said that it is so on th score of overreaching, so that the transaction be not annulled,<span class="x" onmousemove="('comment',' It is established that in any transaction if an error is made which is more than a sixth of the value of the goods the transaction is void; if it is exactly a sixth, the transaction stands but the amount of error must be returned; if less than a sixth the transaction is valid and there is no redress. V. B.M. 50b. Now if weights and measures may be increased by more than a sixth, then traders who were ignorant of the increase and who sell their goods in the present measures at the former prices would be defrauded by more than a sixth, with the effect that all their dealings would be declared void. In order to obviate this the increase in weights and measures was limited to a sixth.');">¹²</span> but surely Raba said, On account of any fraud in measure, weight or number, even though it is less than the standard of overreaching, one can retract.<span class="x" onmousemove="('comment',' V. supra ');">¹³</span>

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