Economics & market laws · law 026
Law of One Price
By Shivam Bhandari · Reviewed 31 October 2026 · How we write
what it means
In an efficient market, identical goods should sell for the same price everywhere, after accounting for transport and taxes.
How Law of One Price works
If a phone is much cheaper in one city, traders buy it there and sell it in the other until prices converge. That arbitrage pressure is why online marketplaces make prices so transparent.
Businesses escape the law of one price by making their product not identical — through brand, service, bundling, location, or convenience.
where it comes from
A core idea in classical and international economics, closely tied to arbitrage and purchasing-power parity. The Economist's Big Mac Index (since 1986) is a playful test of it.
Law of One Price examples in business
Electronics
Price comparison sites push the same phone model to almost the same price across sellers.
Differentiation
A local shop charges a little more than online for the same item but wins on same-day availability and returns.
Grey markets
When a brand prices very differently across regions, parallel imports appear to exploit the gap.
How to apply it
- 1If your product is identical to competitors', expect price to be the battleground.
- 2Add something hard to compare: service, warranty, bundle, or speed.
- 3Keep regional price differences within the cost of moving goods, or expect arbitrage.
- 4Use exclusive SKUs or bundles to make price comparison harder.
common misreading
Real markets rarely have one price because of transport costs, information gaps, and differentiation — the law describes the pressure, not a fixed rule.
ask yourself
What makes your offer not identical to the cheapest competitor's?
put it into practice
Frequently asked questions
What is Law of One Price?
In an efficient market, identical goods should sell for the same price everywhere, after accounting for transport and taxes. If a phone is much cheaper in one city, traders buy it there and sell it in the other until prices converge. That arbitrage pressure is why online marketplaces make prices so transparent.
Who came up with Law of One Price?
A core idea in classical and international economics, closely tied to arbitrage and purchasing-power parity. The Economist's Big Mac Index (since 1986) is a playful test of it.
How do you apply Law of One Price in business?
1. If your product is identical to competitors', expect price to be the battleground. 2. Add something hard to compare: service, warranty, bundle, or speed. 3. Keep regional price differences within the cost of moving goods, or expect arbitrage. 4. Use exclusive SKUs or bundles to make price comparison harder.
What is a common misunderstanding of Law of One Price?
Real markets rarely have one price because of transport costs, information gaps, and differentiation — the law describes the pressure, not a fixed rule.