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What does l'didei shaveh li (subjective value) mean in halacha (הלכה)? The Rashba limits it to a gaver raba (prominent person) whose lifestyle involves paying more, while the Rambam (רמב"ם) extends it to anyone. The shiur develops a fundamental distinction: subjective need alone doesn't create halachic value, but using an object to discharge a monetary obligation does define its worth—five lirot paid for pidyon haben makes the object worth five lirot without requiring l'didei shaveh li.
This shiur analyzes Kiddushin 8a and the principle of l'didei shaveh li—the halachic concept that a person can declare an object to be worth more to him than its market value, thereby avoiding ona'ah (price fraud). The Gemara (גמרא) discusses a case where Rav Kahana took a sudra (scarf) worth three lirot for five lirot, declaring "l'didei shaveh li chamish" (to me it is worth five). This creates a fundamental question addressed by the Rishonim: does this principle apply universally, or only in specific circumstances? The Rashba maintains that l'didei shaveh li only works for a gaver raba (prominent person), while the Rambam (רמב"ם) holds it applies to anyone. Rabbi Zweig develops a novel understanding of the Rashba's position: gaver raba does not simply mean someone who needs something badly. Rather, it refers to someone whose entire lifestyle involves paying premium prices—someone who tips lavishly, buys designer labels, and projects affluence through spending. Such a person genuinely assigns higher value to objects because paying more is part of their self-image and social standing.
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Kiddushin 8a
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Why does the Gemara present a kal v'chomer for chuppah making kiddushin based on kesef not being maichel b'terumah, only to reject it? The shiur reveals that even the rejected kal v'chomer establishes a fundamental yesod: kiddushin is a kinyan for ishus (marital relationship), not merely a kinyan in hilchos kinyanim. The second kal v'chomer—from chuppah being gomeres—raises Tosafos's famous question.
Is the kesef used in kiddushin a true kinyan (acquisition), or merely a symbolic means of establishing marriage? The shiur analyzes multiple interpretations of the Gemara's derivation from ki yikach ki'ach mi'Sayeffron, exploring whether marriage constitutes ownership, and develops three fundamental approaches: (1) The Gemara proves ishus is a kinyan, (2) ishus is not a kinyan but uses kinyan-like means, or (3) ishus is a kinyan but the kesef may not be a ma'aseh kinyan. The Rambam's position—calling kesef "midivrei sofrim"—is explained as distinguishing between cross-referencing concepts versus borrowing terminology.
Why does the Mishna alternate between the language of "kinyan" (acquisition) and "kiddushin" (sanctification) when describing marriage? The shiur develops a fundamental distinction: marriage has two separate aspects—a kinyan dimension (ownership) and a kedusha dimension (sanctified relationship). Either aspect can initiate the bond, and understanding this dual nature resolves multiple textual and halachic questions throughout the sugya.
Does kiddushei shetar require a shevah pruta? The Ran presents two approaches to the Rif's position. The shiur develops the Ran's second pshat that shetar kiddushin functions as a hachnah (exchange) rather than a mere kinyan nesina. This reading has profound implications for isuri hana'ah, mechubar, and the relationship between kesef and shetar.
