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Answer: Before we get to the excellent conceptual question, we must briefly raise some points that can, under certain circumstances, make the question moot in this scenario.
Bemare Habazak - Rabbis Questions (654)
Rabbi Daniel Mann
385 - Electronic Communication before Davening
386 - Buying a House with a Hidden Treasure
387 - Missing a Key Word from Al Hamichya
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Secondly, it is far from clear that Reuven owns the gold coins. If he does not know about them, he apparently did not put them there. Whoever did, or his inheritor, is likely still the owner, and Shimon might have to return them, not keep them. Even if the money became ownerless, if it is hidden in a manner that Reuven was likely to never find it, he did not acquire the treasure with the house. Thus, Shimon is like one who knows where an ancient treasure is found and waits for others to leave the area and then digs it up. He would not be taking Reuven’s coins. See further details and sources in Living the Halachic Process, III, I-16.
So, we will present the fundamental question with a different scenario. A petroleum exploration company discovered vast deposits in a certain region and sent people to secretly buy up as much land as possible from unknowing sellers.
There are generally two grounds to void a sale after the fact. 1. Mekach ta’ut – the object was flawed in such a way that we can assume that the buyer would not have agreed to the purchase had he known. 2. Ona’ah (mispricing) – while the sides would have agreed to the sale, the price was far enough from the going rate to make it grossly unfair to one side.
The gemara (Ketubot 97a) tells of people who sold real estate to buy grain during a famine, without knowing that a large shipment was about to arrive. Rav Nachman said that they could back out of the sales because it was based on a mistake about grain’s availability. Kinyan Torah Bahalacha (I:14) applies this concept to a case of one who sold land that had been slated for agriculture when a governmental decision to allow home building had been made but not publicized. He says that if the seller would not have sold it had he known, he can back out. If he would have sold it anyway but at a much higher price, then we get into the issue that the laws of ona’ah do not generally apply to real estate (Shulchan Aruch, Choshen Mishpat 227:29). On the other hand, the Rama (ad loc.) states that if the price was double (or half) of the going rate, the laws do apply. Also, according to most poskim, although the laws of ona’ah (returning money, nulling sales) do not apply to real estate, there is still a prohibition to buy or sell at an unfair price (R. Akiva Eiger ad loc. based on Ramban; S’ma 227:51).
Certain poskim raise other distinctions. The general rule is that proper pricing follows what is prevalent at the time and place involved (see Pitchei Choshen, Ona’ah 11:7). The Imrei Yosher (II, 155) says that if information changes the price, it depends if it is known to a majority of the population. Also, the gemara (ibid.) indicates that there is a difference between a situation that is about to be revealed and one that may remain unknown for an indefinite amount of time. The Kesef Hakodashim (CM 227:(9)) posits that even when a situation is about to be known, that only makes a difference when the issue is lack of interest in the transaction had the information been known. If, though, it is about price propriety, the going rate at that time/place based on the publicly available information is the determinant.
Bemare Habazak - Rabbis Questions Ask the Rabbi: Omitting Tachanun in Selichot in the Presence of Simcha
Rabbis in Midrash
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Kuzari -Rabbi Ari Shvat Kuzari class 9 - "Seeing is Believing" (parag. 21-30)
These paragraphs elaborate on the theme that seeing and knowing is better than any attempt to prove logically, and begins explaining the difference between Israel and gentiles.
Ein Aya Various Universal Stages of the Geula Process
Rav Kook examines the various stages of redemption, explaining how (in addition to the obvious oft-mentioned stages of ingathering the exiles, reviving the Hebrew language, army, state etc.) the messianic dream of world prosperity, the State of Israel and world unity can and are realistically and logically gradually coming true.
Kuzari -Rabbi Ari Shvat Kuzari class 8- "Answering Questions on the Kuzari's Proof from Mass Revelation
How do we know that the "claim" of mass revelation to 2,000,000 witnesses at Mt. Sinai is really true? This important class answers all of the questions skeptics ask about this claim of the Kuzari.
Ein Aya Armies Still Necessary for Balance & the War Against Wars
Rav Kook explains why the world was originally divided into the various seemingly contradicting ideologies and cultures, in order to develop each one respectively. Swords or armies symbolize how each respective ideology defends themselves, as well as deters their opposing ideologies and cultures. On the other hand, the messianic era will be one of peace, and Rav Kook explains the transition to that stage, which mankind is already undergoing.
The Land of Israel LGBT'S IN ISRAEL
The question was asked, how can one make Aliyah with the LGBT parades?
Kuzari -Rabbi Ari Shvat Kuzari class 7 - Five Accumulative Proofs of G-d
As a preparation for the Kuzari's classic proof of G-d from the mass-revelation at Sinai, we start here with 5 other directions to strengthen our belief which also contribute to what the Kuzari will present as well.
Ein Aya Muscle & Meaning: The Dual Nature of Gevurah (Physical Strength)
Is physical strength and fitness a necessity or an ideal? Although it if often totally overlooked among topics of Judaism, Rav Kook writes that it clearly is also a necessity to deter the many enemies of Israel, but even in Y'mot HaMashiach, in the Messianic era, to a certain extent, it's ideal continues even after our enemies will have been finished off.
