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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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