Commentary for Avodah Zarah 11:15
למאי נפקא מינה דאית ליה בהמה לדידיה אי אמרת משום הרווחה הא קא מרווח ליה אי אמרת משום עור לא תתן מכשול הא אית ליה לדידיה
What is the practical difference [between the two explanations]?... If the idolater has an animal of his own. If you say [the prohibition is] because of profit, here, too, he causes him to profit. If however you say it is because of placing a stumbling block before the blind, here, then, he has [a sacrifice] of his own.
Daf Shevui to Avodah Zarah
If the idolater has another animal of his own, then if the prohibition is due to profit, it is still in effect because by selling the idolater another animal, the Jew still causes him to profit. If, however, the prohibition is because of placing a stumbling block before the blind, then if the idolater has another animal to sacrifice, the Jew is not enabling him to offer a sacrifice. The idolater could have sacrificed one anyway.
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