Bava Metzia 46

Rav Shach (laws of marriage 1:2)holds that there are only two types of exchange, equal to equal, or acquisition by a handkerchief. [To Rav Shach exchange of a needle for a suit of armor is equal to equal since this one wants a needle and the other wants a suit of armor.] Rav Shach holds the exchange is applicable to marrying a woman, not the acquisition by a handkerchief. ([This is like the Tosphot R'id who holds acquisition by handkerchief that is worth more that a pruta can acquire a wife.])According to this, we must say that when Rav Nachman said in Bava Metzia 46 and Kidushin 28b that fruit can not make an exchange, he must mean it cannot create an exchange but that it can be acquired by exchange. To make my comment here clear let me bring a few points. First Rav Shach is only talking about the approach of the Rambam. Clearly, Tosphot and Rabbainu Tam are utterly different. Also, we know the law is like Rav Nachman that fruit can not make an exchange, but rather only vessels. But what is a vessel? To Tosphot, a vessel is anything that can be used. But to Rav Shach this must mean that which can create an acquisition, not that which can be acquired because he holds a woman can be acquired by exchange of equal to equal. This approach of Rav Shach I must mention is not like Tosphot that there is exchange equal to equal, and a different kind that is not equal to equal, but is still not acquisition by handkerchief nor shoe. ------------------------------------------------------------------------------------------------------------------------------------- [laws of marriage 1:2] holds that there are only two types of exchange, equal to equal, or acquisition by a handkerchief. [To רב שךexchange of a needle for a שריון is equal to equal since this one wants a needle and the other wants a suit of שריון.] רב שךholds the exchange is applicable to marrying a woman, not the acquisition by a handkerchief. According to this, we must say that when רב נחמן said in בבא מציעא מ''ו ע''ב and קידושין כ''ח ע''ב that fruit can not make an exchange, he must mean it cannot create an exchange but that it can be acquired by exchange. To make my comment here clear let me bring a few points. First רב שךis only talking about the approach of the רמב''ם. Clearly, תוספות and רבינו תם are utterly different. Also, we know the law is like רב נחמן that fruit can not make an exchange, but rather only vessels. But what is a vessel? To תוספות, a vessel is anything that can be used. But to רב שך this must mean that which can create an acquisition, not that which can be acquired because he holds a woman can be acquired by exchange of equal to equal. This approach of רב שךI must mention is not like תוספות that there is exchange equal to equal, and a different kind that is not equal to equal, but is still not acquisition by handkerchief nor shoe.