Arbitrage
Arbitrage is buying and selling, or borrowing and lending, the same or closely equivalent things at the same time in different markets to profit from a difference in price. By exploiting such gaps, arbitrage tends to close them.
Also called: arbitrage trading · FX arbitrage · price arbitrage · triangular arbitrage
In its pure form arbitrage takes no market risk: the trader buys where the price is low and sells where it is high at the same moment, locking in the difference. In practice most arbitrage carries some risk, because the two legs cannot be executed at exactly the same instant, the assets are close substitutes rather than identical, or moving money from one market to the other takes time. The National Bank of Belgium's glossary states the effect plainly: arbitrage equalises prices and interest rates.
Foreign exchange runs on it. Triangular arbitrage keeps the euro-dollar, dollar-yen and euro-yen rates consistent with each other. Covered interest arbitrage links the interest rates of two currencies to the gap between their spot and forward exchange rates. Historically, bimetallic mint ratios that differed from market prices invited bullion arbitrage, the trade behind Gresham's Law. Where an official exchange rate differs from the parallel-market rate, buying at one and selling at the other is arbitrage too, often unlawful and exactly what capital controls are written to stop.
For payments firms, arbitrage explains why price gaps survive only where something blocks the trade: capital controls, slow settlement, prefunding costs, licensing limits or counterparty risk. A persistent premium for stablecoins in one market over another is a measure of how hard it is to move fiat in and out. Arbitrage in this market sense is different from regulatory arbitrage, which exploits differences between rule books rather than prices.
In practice
A price gap that looks like free money usually reflects a cost or risk the trader has not priced: settlement delay, conversion limits, fees, or the chance that an account is frozen mid-trade.
Example
USDT trades at US$1.00 on an international exchange and at the local-currency equivalent of US$1.04 on a domestic peer-to-peer market. Buying 100,000 USDT abroad and selling it locally earns about US$4,000 gross, but only if the local proceeds can be converted and moved back out at a known rate. If that takes two weeks, the trade is a currency bet, not arbitrage.
Learn more on Money Wiki
This page gives the short answer. Money Wiki has a longer guide to Arbitrage, with more detail and background.
Commonly confused with
| Term | How it differs |
|---|---|
| Regulatory arbitrage | Market arbitrage exploits a price difference for the same thing in two places. Regulatory arbitrage exploits a difference in how two jurisdictions or regimes regulate the same activity. |
See also
- Regulatory ArbitrageRegulatory arbitrage is structuring a business to fall under a lighter regulatory regime while serving the same customers and doing substantially the same thing. Some of it is legitimate jurisdiction selection; some of it is a supervisory problem waiting to surface.
- Parallel Market RateA parallel market rate is the rate at which a currency actually trades outside official channels, in a country where the official rate is not obtainable. In a tightly controlled market it is often the only rate at which real business clears.
- P2P TradingP2P trading is buying and selling crypto directly between two individuals, usually through a platform that holds the crypto in escrow while the buyer pays the seller by local bank transfer or cash. The platform matches and escrows; the money itself moves outside it.
- Gresham's LawGresham's Law is the tendency for overvalued money to stay in circulation while undervalued money is hoarded, melted or exported, when the law forces both to be accepted at the same face value. It is usually summarised as 'bad money drives out good'.
- FX SpreadStrictly, the FX spread is the bid/ask spread: the gap between the price at which a currency can be bought and the price at which it can be sold at the same moment. It is a property of the market and of liquidity in that pair.
- Carry TradeA carry trade borrows in a currency with low interest rates and invests the proceeds in a currency or asset paying higher rates, keeping the difference. It earns steadily while exchange rates are calm and can lose heavily when the funding currency jumps.