Bava Metzia chapter 4, Mishnah 9 concludes the topic of monetary ona'ah. The Mishnah lists types of transactions that are exempt from the restriction of selling for a sixth more or less than the true value. (Some learn that there is a restriction even when dealing with a profit of about one hundred percent, but the Mishnah does not mention this.)
"Elu devarim she'ein lahem ona'ah: ha'avadim, vehashtaros, vehakarka'os, vehahakdashos" - these are the things that are not subject to ona'ah: slaves, documents, land, and consecrated items. These four are exempt from the limitations of ona'ah, from the margin of a sixth in either direction:
Slaves - one who buys or sells a slave.
Documents - financial documents, such as a deed of ownership on a house, a stock certificate, or a promissory note that pass from hand to hand.
Land - the land itself, real estate, and anything attached to the ground.
Consecrated items - things consecrated to the Beis Hamikdash that belong, as it were, to Hashem, whether consecrated for Temple upkeep (kodshei bedek habayis), which are intended for their monetary value, or consecrated for the altar (kodshei mizbe'ach), which are designated for the altar. For example: a person who consecrated his cow for a peace offering and it developed a blemish, and he is permitted to sell it to another and transfer the sanctity to a coin - this sale price is not subject to the laws of ona'ah.
The source for the exemption in the verses:
It states in the verse: "When you make a sale to your fellow or buy from the hand of your fellow," and afterward, "a man shall not wrong his brother." Two words in the verse are seemingly superfluous: "sale" and "hand," since it could have simply said, "When you sell to your fellow or buy from your fellow." From this extra wording, Chazal derive the four exemptions:
Land - "From the hand of your fellow" teaches that things which literally pass from hand to hand, namely movable property, are what the laws of ona'ah apply to, but things that do not physically pass from hand to hand, like land, are exempt.
Slaves - they are compared to land everywhere, and therefore their law is like the law of land.
Documents - "A sale" teaches about things that are intrinsically money ("gufo mammon"), where the object itself is bought for its own inherent value. One who buys a pack of paper buys the paper itself, but one who buys a deed of ownership for a house is not buying the piece of paper, which has no importance on its own, but rather the rights embodied within it. Since this is not actual merchandise but a financial document, it is exempt from ona'ah.
Consecrated items - "A man shall not wrong his brother" ("a man to his fellow"), the law applies between human beings, and consecrated property is not a human being acting as a second party to the transaction.
The four exemptions in the laws of theft:
This list of four exemptions repeats itself in other areas of halachah. The first of these is the penalties imposed on a thief: double payment, and fourfold and fivefold payments for one who steals an ox, goat, or sheep and slaughters or sells it. These additional payments do not apply to one who steals these four types of things.
The method of deduction here is different, and it is based on the passage of the thief using the hermeneutical rule of a generalization, a specification, and a generalization ("klal uprat uklal"). The verses first give a broad, general principle - this is the generalization, afterward specific examples - these are the specifications, and finally return to a broad and inclusive expression - an additional generalization. We have a tradition from Moshe from Sinai that in such a structure, "the generalization includes only what is in the specification": the principle does not apply exclusively to the examples, but it is also not completely broad. Rather, it applies to things similar to the specific examples, and Chazal instruct us on the prominent characteristics from which we extrapolate to other cases.
Regarding double payment, it says (Shemos 22:8): "For any matter of trespass" - a generalization, every criminal act and everything stolen. "For an ox, for a donkey, for a sheep, for a garment" - a specification, specific examples that were not strictly necessary to list. "For any lost item" - an additional generalization. Since we find a generalization, a specification, and a generalization, the generalization includes only what is in the specification, and we judge matters similar to the specification.
And what is the common denominator in the examples? Chazal say: something movable, a portable object, and intrinsically money - which is acquired due to its own intrinsic value. Therefore, anything that is movable and intrinsically money is subject to double payments, and the exceptions to this rule are:
Land - which is not a movable object.
Slaves - which are compared to land.
Documents - which are not intrinsically money.
Consecrated items - as it says, "he shall pay double to his fellow," and the collection is only for his fellow's property, and therefore it is exempt.
It is worth noting that the fourfold and fivefold payments apply only to animals. Therefore, the case discussed here involves hekdesh (consecrated property) - a consecrated animal that someone else stole and then sold or slaughtered, which is exempt from fourfold and fivefold payments - whereas lands and documents are entirely excluded from fourfold and fivefold payments in the first place.
Regarding the Laws of Shomrim:
Another area where these four types are exempt or have different laws is the laws of guardians (shomrim). An unpaid guardian (shomer chinam), who was entrusted with an object without payment, is exempt from paying if it is lost or stolen, but must swear that he was not negligent; a paid guardian (shomer sachar), who receives payment, must pay for loss and theft. With these four items, this is not the case, and the derivation is from the exegesis of the verses and the principle of klal uferat ukelal (general, specific, and general).
As the Mishnah states: "Shomer chinam eino nishba" - an unpaid guardian who had one of the four items under his watch and it was lost or stolen, does not swear. "Venossei sachar eino meshalem" - a paid guardian, who is usually liable for loss and theft, does not pay. We will not elaborate here on the derivation itself, but its basis is this: klal uferat ukelal.
The Opinion of Rabbi Shimon: Kodashim for Which He is Responsible:
Rabbi Shimon disagrees, and this is not the first time we have encountered this. In his opinion, even though one who consecrates something makes it God's and it belongs to the Temple, nevertheless, if the person bears responsibility for it - meaning he will have to replace the object if it does not reach its destination properly - he has a financial interest in the matter, as it costs him money, and it is considered his property to some extent. Therefore, the exemptions of the Mishnah do not apply to consecrated property for which the person bears responsibility.
The case is as follows: A person can consecrate in two ways, with a freewill offering or with a vow (as taught in a Mishnah in Tractate Megillah). One who says "this is" - this is a freewill offering, and if the cow develops a blemish, such as becoming blind, it is no longer offered. But one who says "it is upon me" - this is a vow, as he took upon himself an obligation to bring a peace offering. If he subsequently says "this is a peace offering", this cow can be his peace offering; but if it is lost, stolen, or becomes blemished and is unfit for sacrifice, since his obligation was not on a specific cow but to bring an offering in general, its owner remains responsible and is obligated to replace the disqualified one with a new, kosher cow.
In such a scenario, Rabbi Shimon says, since he must replace the animal and has a financial obligation toward it, it is still considered his to some extent, and the exemptions of the Mishnah do not apply - not in matters of theft and double payment, nor in matters of ona'ah. As the Mishnah states: "Rabbi Shimon omer: Kodashim shehu chayav be'acharayusan - yesh lahem ona'ah" - Rabbi Shimon says: consecrated property for which he is responsible is subject to the laws of ona'ah. How so? A person said "it is upon me to bring a peace offering", taking upon himself a vow, and then pointed to a specific sheep and said "this is a peace offering". The sheep developed a blemish and he needed to sell it - this sale is subject to the laws of ona'ah, and one cannot overcharge him or underpay him by more than a sixth, since the difference comes out of his pocket. "Veshe'eino chayav be'acharayusan - ein lahen ona'ah" - with consecrated property that he does not bear responsibility to replace, Rabbi Shimon agrees that the law of ona'ah does not apply, since the word "his fellow" in the verse exempts it.
The Opinion of Rabbi Yehuda:
Rabbi Yehuda maintains that the concept of monetary ona'ah is much more limited than one might have thought, and the exemptions are not restricted to just those four examples: "Af hamocher sefer Torah, behemah umargalit - ein lahem ona'ah" - also one who sells a Torah scroll, an animal, or a pearl, they are not subject to ona'ah. These three are added to the four and are exempt from the price limitations of ona'ah.
A Torah scroll - for one who buys or sells it, there is no limit to its appraisal, as it is more precious than fine gold, and one cannot put a price tag on it.
An animal and a pearl - these are not standard commodities, but rather each has its own unique character. One who wishes to buy an ox wants an ox of the same size and strength as the ox already in his possession, so that they can work as a pair; one who wishes for a pearl is looking for a stone that matches the color and shape of the earring he holds. Since each item is unique, its value varies from buyer to buyer: someone who has a matching pearl is willing to pay more than someone who does not. It emerges that there is no uniform fair market price here, but rather a range of fairness from the buyer's perspective, according to the extent of his need and his purpose. Therefore, items that are not completely identical commodities, like a pound of wheat or a measure of oil, are not subject to the laws of ona'ah.
The Sages' Response and Practical Halachah:
The Sages replied to him, and such is the halachah: The exemption applies only to the four items listed at the beginning of the Mishnah, which were excluded by the verses, while everything else is subject to the price limitations of ona'ah. The reason is that, in truth, every transaction is like this. Even with a basic commodity, a person might specifically need this exact wheat for his recipe this evening, making it worth more to him than to others. If we follow this logic, the Torah's entire concept of ona'ah would be nullified, and the protections against financial fraud and price gouging would be lost. Therefore, aside from the four categories at the beginning of the Mishnah, the law of ona'ah applies across the board, even to unique items, and the price is determined by the fair market value for a regular person in the market.
In summary: In this Mishnah, we learned that slaves, documents, land, and consecrated property are exempt from the laws of ona'ah, and that the source of the exemption is the exposition of the verse, "And if you sell something to your fellow or buy from your fellow's hand." We saw that this same list repeats regarding a thief's payments and the laws of watchmen, derived through the rule of a general, specific, and general term - meaning movable property with intrinsic monetary value. We examined the opinion of Rabbi Shimon, who differentiates regarding consecrated property between items one is responsible to replace and items one is not responsible to replace, as well as the opinion of Rabbi Yehudah, who exempts even a Torah scroll, an animal, and a pearl - against whom the halachah follows the Sages, that there is no exemption other than the four original categories.