Week 1: Ona'ah — the Torah's surprisingly modern take on price gouging
This week: ona'ah — the halachic prohibition on overcharging. What your kids are learning, three dinner table questions, and what it means for your own financial life.
This week, we're starting with one of the most grounded — and most overlooked — concepts in Jewish commercial law. Ona'ah (oh-NAH-ah) is the Torah's prohibition on financial exploitation through mispricing: charging significantly more (or less) than something is worth. It comes from a verse in Leviticus, gets operationalized in the Talmud's Tractate Bava Metzia, and turns out to be a remarkably precise framework for thinking about fairness in everyday transactions.
This Week's Sourceוְכִי־תִמְכְּר֤וּ מִמְכָּר֙ לַעֲמִיתֶ֔ךָ אַל־תּוֹנ֖וּ אִ֥ישׁ אֶת־אָחִֽיו׃"When you sell to your neighbor or buy from your neighbor's hand, do not wrong one another."Vayikra (Leviticus) 25:14
📚 Teaching It: What Your Kids Are Learning This Week
K–6 students are getting the concept through story: a girl selling honey cake at a market, a wise neighbor, and the question of what it means to charge a fair price. The big ideas: Torah cares about how we treat each other with money, fairness goes both ways, and there's a real line between "charging what you can" and "wronging someone."
High school students are going deeper — the actual sources (Vayikra 25:14, Mishnah Bava Metzia 4:3, Rambam's Mishneh Torah), the one-sixth threshold rule, and real scenarios: eBay pricing, salary negotiation, tipping. They're wrestling with the harder question: why does halacha create a "just price" concept at all, when Western contract law says consent is enough?
🍽️ Three Questions to Ask at Dinner
- "What's the difference between charging what you can get and charging what's fair?"
- "If someone sold you something without knowing it was worth way more, would you feel okay about that deal?"
- "The Torah says don't 'wrong' someone in a sale. Do you think that means you have to volunteer information, even if they didn't ask?"
💼 Living It: Ona'ah for Adults
The Mishnah (Bava Metzia 4:3) and Rambam (Hilchot Mechirah 12:1) establish three tiers:
| Less than 1/6 overcharge | Sale stands, no remedy |
| Exactly 1/6 overcharge | Sale stands, excess returned |
| More than 1/6 overcharge | Sale is voidable |
In today's terms: sell your used car for $12,000 when fair market value is $10,000 — you're right at the line. A consultant quoting $275/hr to a nonprofit that doesn't know the going rate is $150 — that's not a gray area. At 83% markup it's well past the one-sixth line, which means halachically the contract isn't just questionable — it's voidable. The fact that they said yes doesn't clear you.
One Question Worth Sitting With This Week
Is there a transaction in your life — a deal you made, a price you charged, a service you hired — where, if you're honest, you knew the information wasn't equal? What would you do differently?
Wishing you a meaningful week — and a Shabbos table conversation worth having.
The Money & Mitzvot Team