Question
I was shopping in a local electronics store and noticed that a new laptop that normally sells for around $1,200 had a price sticker showing only $12. When I brought it to the register, the cashier noticed the mistake and told me that the real price was $1,200. In another case, I saw an expensive item advertised online for a fraction of its normal price due to what appeared to be a pricing error. In both situations, I wondered: according to halacha, must the merchant honor the mistaken price, or may he retract and charge the correct amount? Does it make a difference whether the mistake is discovered before payment, after payment, in a physical store, or in an online order?
Answer
According to the basic halachic laws of Kinyan and Ona’ah (price fraud), a merchant is not required to honor an obviously mistaken price. On the contrary, if a product was sold at a price that deviates significantly from its market value, the sale may be void or subject to reimbursement even after the fact. A pricing error of more than one-sixth of the item’s value generally enters the category of serious Ona’ah.
However, business transactions are also governed by the principle of Minhag Hamedinah—the accepted commercial practice and law of the country. Consequently, the practical ruling may differ between jurisdictions.
In Israel, consumer law generally requires stores to honor the displayed shelf price. In the United States, merchants are generally not required to honor an obvious pricing mistake prior to completion of the sale. Whether these civil laws are also fully binding from a halachic perspective in every circumstance requires further analysis.
Explanation
The Basic Halachic Rule: A Sale Based on a Major Pricing Error Is Invalid: The Torah prohibits both overcharging and undercharging when unbeknownst to the parties. A sale is expected to reflect the market value of the item being sold. When a substantial discrepancy exists between the actual value and the price paid, the laws of Ona’ah apply.
The classic rules are:
| Amount of Error | Halachic Result |
| Less than one-sixth | Sale remains valid |
| Exactly one-sixth | Sale remains valid, but the difference must be returned |
| More than one-sixth (16.6%) | Sale is subject to cancellation |
Thus, if an item worth $100 is mistakenly sold for $1, this is not merely a small pricing discrepancy. It is an extreme departure from market value, far beyond the threshold discussed in the laws of Ona’ah. Under the ordinary rules of Choshen Mishpat, such a transaction would not obligate the merchant to absorb the loss. Furthermore, the halachos of Ona’ah apply even when the mistake was made unintentionally. If either party later discovers the error, they are obligated to correct it.
What if the Sale Already Took Place?
Under the ordinary laws of Ona’ah, if a major pricing mistake exceeded the threshold of one-sixth, the sale may be invalidated even after it occurred. The purchaser cannot insist that the merchant continue honoring a transaction that halacha considers fundamentally defective.
Accordingly, from the pure standpoint of halacha, if a $500 item was mistakenly sold for $1, the merchant would generally retain the right to demand correction of the error.
Before The Sale Has Taken Place – No Michsurei Emuna or Mi Sheapara:
An additional point that must be emphasized is that, under halacha, until a valid Kinyan or binding transaction has taken place, either party generally retains the ability to back out of the proposed deal. While there are circumstances in which retracting from a verbal commitment may be subject to criticism and the concept of Mechusar Amanah (lack of trustworthiness), that is only when a person simply changes his mind after reaching an agreement.
In the case under discussion, however, the seller is not retracting because he reconsidered the transaction. Rather, he is retracting because he discovered a major pricing error that falls under the laws of Ona’ah and Mekach Ta’us. In such a case, even after a Kinyan takes place, halacha often grants rights of cancellation and correction. Certainly before a Kinyan has taken place, there is little basis to claim that the merchant must proceed with a transaction that he immediately realizes was founded on a substantial mistake. Therefore, the concepts of Mechusar Amanah or Mi Shepara would generally not apply in such a situation, as the retraction is based on a recognized halachic error in the terms of the transaction rather than a mere change of mind.
The Major Qualification: Minhag Hamedinah
At this point, another major halachic principle enters the discussion.
Commercial transactions are often governed not only by the technical laws of Ona’ah but also by accepted business customs and legal norms.
Therefore, when a country’s accepted commercial system establishes specific rules governing mistaken prices, those practices can have halachic significance as part of the binding customs of commerce.
For this reason, one cannot answer modern pricing-error questions solely through the lens of Ona’ah without considering the local commercial system as well.
Israel: The Displayed Price Is Generally Binding
Israeli consumer law generally provides that the price displayed on a product is the binding price, even if the register reflects a higher amount. The consumer is entitled to pay the displayed price, and in certain cases refusal may expose the merchant to statutory penalties.
Nonetheless, even in Israel the matter may not be absolute. Courts have occasionally distinguished between ordinary pricing discrepancies and absurdly obvious mistakes where any reasonable consumer would recognize that an error occurred. Courts in Israel have, at times, refused to enforce extreme errors where the purchaser clearly knew the price could not be genuine. Accordingly, a price difference of a few shekels is not the same as a one-shekel sticker on an expensive electronic device.
Furthermore, one can distinguish between before a sale has taken place and after a sale has taken place. After the sale has already been completed, there is a stronger halachic argument to say that the ordinary laws of Ona’ah no longer apply in their classic form, due to the accepted commercial practice and legal framework of the country. In Israel, where the law generally requires merchants to honor the displayed price and imposes significant penalties for refusal—including statutory damages of up to 10,000 NIS—the commercial norm is to accept and absorb ordinary pricing errors rather than challenge them after the sale has been completed. Accordingly, one can argue that merchants enter commerce with the understanding that such mistakes will occasionally occur and that they accept this risk as part of doing business. In halachic terminology, this may be viewed as a form of implicit waiver of Onah based on accepted commercial custom.
Prior to the sale being completed, however, the matter is far less clear. Halacha generally does not obligate a person to proceed with a sale that has not yet been finalized, particularly when he immediately discovers that a substantial mistake has occurred. Therefore, it is difficult to argue that the civil rule requiring a merchant to honor a mistaken displayed price before any sale has taken place automatically becomes binding under halacha. While a merchant may be legally required under local consumer legislation to honor the displayed price, further analysis is required as to whether this obligation is merely a civil regulatory requirement or whether it attains the status of a binding commercial custom (Minhag Hamedinah) under halacha. After the transaction has already been completed, however, there is a much stronger argument that accepted commercial practice governs the outcome.
What About Online Stores in israel?
Online stores are different.
In most online transactions, the order is not considered final merely because the customer placed the order. Rather, the merchant generally retains the right to confirm, process, and fulfill the order.
Accordingly, if the merchant notices the mistake before shipment or fulfillment, he may generally cancel the order and inform the customer that the listed price was erroneous. As a practical matter, both legal systems and commercial custom generally recognize such a right. Thus a customer who orders a $1,000 product for $1 because of a website error generally does not acquire an enforceable right to receive it at that price merely by pressing the order button.
United States: Obvious Mistakes Typically Need Not Be Honored
American law generally treats obvious pricing mistakes very differently from Israeli consumer law.
Ordinarily, until the item has been sold and paid for, the merchant may simply inform the customer that an error occurred and charge the correct price. Likewise, online retailers commonly reserve the right to cancel erroneous orders prior to shipment. The prevailing American approach is hence that obvious pricing mistakes generally need not be honored before completion of the transaction.
The Ethical Perspective
Even when a customer can find a legal argument in his favor, there is another issue to consider.
The halachos of Ona’ah are founded upon fairness and honesty in commerce. If everyone involved recognizes that a product worth hundreds of dollars was accidentally listed for one dollar due to a clerical or computer error, exploiting that mistake raises serious ethical and halachic concerns.
Just as a seller may not knowingly overcharge a buyer, a buyer should not knowingly take advantage of an obvious pricing error.
Sources
- The Torah prohibition against charging a price that significantly deviates from market value: Michaber C.M. 227:1-4; Admur C.M. Hilchos Onah; Rambam Mechira 12:2; Mishneh Bava Metzia 51a
- The rule that an Ona’ah greater than one-sixth allows cancellation of the sale: Michaber C.M. 227:4; Admur C.M. Hilchos Onah ; Rambam Mechira 12:2
- The rule that exactly one-sixth requires reimbursement of the difference: Michaber C.M. 227:2; Admur C.M. Hilchos Onah Halacha 2; Rambam Mechira 12:3-4
- The rule that Ona’ah applies even when committed by mistake: Admur C.M. Hilchos Onah Halacha 3
- The rule that Ona’ah does not apply when accepted in commerce: See Michaber C.M. 227:3; 21; Admur C.M. Hilchos Onah Halacha 2; 4
- Israeli consumer law that the displayed price is generally the binding price: Consumer Protection Law discussion, Sections 17A-17G
The role of accepted commercial custom in determining business practice: Michaber C.M. 229:2; 230:10; 232:6