Hello kollel!
In a shiur recently I saw the gemara Bava metzia 47 and the statement that money is effective as a kinyan deoraita.
assuming we hold this way, why in kiddushin would we need a gezeira shava on "kicha" to prove Kedem works? I don't think the Gemara there is trying to prove that kiddushin is a kinyan, I think that's given and they're discussing the mechanisms.
Thank you!
Josh
Shalom Josh,
The Gemara in Bava Metzia is explaining that the verse is teaching us that when you purchase an item the Kinyan is made through "Kesef." Even though we have established that "Kesef" is a bonafide Kinyan, we still need the Gemara in Kidushin to teach us that this Kinyan works on a woman for marriage as well. I think that answers your question even after adopting your assumption that you don't think "the Gemara there is trying to prove that Kidushin is a Kinyan." We could actually debate that assumption (see Rashi DH Mishum d'Kabuy), but for the purpose of answering your question, I don't think it is relevant.
I'd like to bring to your attention that when someone is learning and arrives at a Sugya of Inyana d'Yoma it is a sign that he is learning well. I have heard that some say this on Parshas ha'Shavu'a as well. Ashrecha that you are learning Bava Metzia and you had Siyata d'Shmaya to get to Sedeh Efron in this week's Parshah through your question.
Shimon Brodie