Glossary term
Arbitrage
Arbitrage is an attempt to profit from a price difference between related assets, markets, or securities, often by buying in one place and selling in another.
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What Is Arbitrage?
Arbitrage is an attempt to profit from a price difference between related assets, markets, or securities. A simple example is buying an asset where it is cheaper and selling it where it is more expensive.
Textbook arbitrage sounds nearly risk-free, but real-world arbitrage usually includes execution risk, timing risk, financing costs, taxes, transaction costs, and the chance that the price gap widens before it closes.
Key Takeaways
- Arbitrage seeks to profit from price differences.
- It often involves related assets or the same asset trading in different places.
- True risk-free arbitrage is rare and usually disappears quickly.
- Transaction costs, speed, liquidity, and execution quality can erase the opportunity.
- Retail investors should be careful with strategies marketed as easy arbitrage.
How Arbitrage Works
Suppose the same security trades for $100 in one market and $101 in another. A trader might try to buy at $100 and sell at $101. If the trade can be done instantly and cheaply, the trader captures the spread. In practice, the price may change, the order may not fill, costs may apply, and the apparent spread may disappear.
Professional arbitrage often relies on technology, market access, balance-sheet capacity, and risk controls that ordinary investors do not have.
Common Arbitrage Examples
Type | Main idea |
|---|---|
Price arbitrage | Same or similar asset priced differently in two markets |
Merger arbitrage | Trading around the spread between a takeover price and current market price |
Convertible arbitrage | Trading relationships between convertible securities and related equity |
Each version has its own risks. A merger can fail. A price gap can widen. Borrowing costs can rise. Liquidity can disappear.
Why Arbitrage Matters
Arbitrage helps markets become more efficient because traders who exploit price gaps can push prices back into alignment. That does not mean every arbitrage strategy is safe. Many strategies are complex and depend on assumptions that can break during stress.
For most investors, arbitrage is better understood as a market mechanism than as a casual trading opportunity.
The Bottom Line
Arbitrage seeks to profit from price differences between related assets or markets. The clean textbook version is rare; real-world arbitrage usually depends on speed, costs, liquidity, financing, and execution.