Commentary for Kiddushin 56:5
מ"ט סבר לה כר' יוחנן דאמר דבר תורה מעות קונות ומה טעם אמרו משיכה קונה גזירה שמא יאמר לו נשרפו חיטיך בעלייה
Now, this agrees with R'Shesheth, who maintained: Produce can effect a barter. But on R'Nahman's view, viz. , that produce cannot effect a barter, what can be said? - It means this: Money sometimes ranks as [an object of] barter.
Daf Shevui to Kiddushin
Generally speaking money cannot acquire—so why did this mishnah allow money to acquire (in this limited circumstance)? The answer is that from the Torah, money can acquire. The rabbis decreed that money does not acquire goods lest someone sell some wheat, take the money and then tell the other person that his wheat was burned. In other words, the law that money does not acquire was created for the protection of the buyer.
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