What Is Arbitrage? Profiting From the Same Thing at Two Prices
Arbitrage is buying an asset cheap in one place and selling it dearer in another at the same time, for a near-riskless profit. We explain the types, why it is hard, and why it keeps markets fair.
Same asset, two prices, instant profit
Arbitrage is exploiting a price difference for the same asset in two places at the same time: buy where it is cheap, sell where it is expensive, and pocket the gap. In theory it is a near-riskless profit because you are not betting on direction β you lock both sides at once.
Common types
- Cross-exchange: Bitcoin trades slightly higher on one exchange than another; buy on the cheap one, sell on the dear one.
- Triangular (FX/crypto): three pairs whose prices are momentarily inconsistent β loop through all three and end with more than you started.
- Cash-and-carry: buy the spot asset and sell a futures contract when the futures price is high relative to spot, capturing the difference (linked to the funding rate).
- Statistical arbitrage: trading two historically linked assets when their spread stretches, betting it reverts (related to mean reversion).
Why it is much harder than it sounds
The "free money" almost never survives contact with reality:
- Fees and spread eat the gap. A 0.3% price difference is not profit if you pay 0.2% in fees on both legs.
- Slippage and speed. The gap closes in milliseconds; by the time a human clicks, it is gone. This is a game for fast bots.
- Liquidity limits. You can only trade the size the order book allows before you move the price against yourself.
- Transfer and settlement risk. Moving assets between venues takes time, and the price can move while you wait.
Why arbitrage is actually useful
Even though it looks like pure self-interest, arbitrage is what keeps prices fair. Every time someone buys the cheap side and sells the dear side, the two prices converge. This is why the same asset costs almost the same everywhere, and why persistent gaps usually signal a hidden cost, a risk, or a scam β not a gift.
Conclusion
Arbitrage is buying an asset cheap in one place and simultaneously selling it dearer in another for a near-riskless profit. Types include cross-exchange, triangular, cash-and-carry, and statistical arbitrage. In practice fees, spread, slippage, speed, and liquidity make it far harder than it looks β it is dominated by fast automated systems. Its side effect is valuable: arbitrage forces prices to converge and keeps markets efficient.
Next step
Chasing millisecond gaps is a losing game for humans. Automate the boring, winnable strategy instead.
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