Reference for Bava Metzia 158:7

היכי דמי אי דשכיח למזבן חמר נמי ליעכב ואי דלא שכיח למזבן שוכר נמי לא ליעכב

or on account of the additional cordage necessary.<span class="x" onmousemove="('comment',' For the extra load (which the second may wish to add, according to Tosaf., or quite simply, on Rashi's interpretation). The shipowner having failed to provide himself with additional cordage, may have to pay a higher price for the cordage on his voyage than in the ship's home port, and therefore he has cause for resentment. ');">⁷</span>

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