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The Gemara (גמרא) asks why chalipin doesn't work for kiddushin when it works by Sde Efron. Tosafot explains the havamina held chalipin (when worth a shever pruta) works mi-tam kesef, making it a form of kesef kinyan. The maskana rejects this: chalipin is a separate kinyan (kinyan acher), not a form of kesef, which explains why it doesn't work for kiddushin where only kesef is valid.
This shiur presents an in-depth analysis of Tosafot on Kiddushin 3a, examining the fundamental question of whether chalipin (barter-exchange) operates as a form of kesef (monetary acquisition) or as an entirely separate kinyan. The discussion centers on understanding both the Gemara (גמרא)'s havamina (initial assumption) and its maskana (conclusion). The Gemara's question is straightforward: if chalipin works to acquire Sde Efron, why shouldn't it work for kiddushin? Tosafot explains that the Gemara's havamina was that chalipin functions mi-tam kesef—that is, chalipin operates on the principle of kesef, making it essentially a kesef-type kinyan. According to this understanding, since kesef works for kiddushin, chalipin should work as well. The critical qualification, however, is that Tosafot limits this to chalipin sheyesh bo shever pruta—barter involving an object worth at least a minimal value.
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Kiddushin 3a
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