What is arbitrage in trading?
In one line: Arbitrage is buying something in one place and selling the same thing in another at the same time, to capture a small difference in price.
A simple example
Say a coin trades at $100.00 on exchange A and $100.40 on exchange B at the same moment.
You buy 10 coins on A for $1,000 and sell 10 on B for $1,004. The gap is $4. Now take away the costs: fees on both sides, the Spread, and the cost of moving money between the two. If those come to $3, $1 is left. If they come to $5, the "free" trade lost $1.
That's arbitrage. A math example, not a promise.
Why price gaps don't last
Gaps like this get closed fast, often in fractions of a second. Firms with fast computers, cheap fees and money parked on many venues do this all day. That's what High-frequency trading is largely built on.
When they buy the cheap side and sell the expensive side, both prices move toward each other. The gap disappears.
Why it matters
Arbitrage is one reason prices for the same thing stay close across markets. ES futures and the S&P 500 stocks, a stock and its ETF, bitcoin on two exchanges: arbitrage keeps them tied together.
That's useful to know. It means you rarely need to hunt for a "better price" somewhere else. The gap you see is usually the cost of crossing it.
A common mistake
Thinking arbitrage is risk-free money. On paper it is. In real life there are delays, fees, Slippage, withdrawal limits, and the chance one side fills and the other doesn't. Then you're simply holding a position.
Be wary of anyone selling an "arbitrage bot" that promises steady returns. It's a common pitch in crypto scams.
There's also Merger arbitrage, a slower version built around company takeovers, with its own risks.
Questions
Is arbitrage legal?
Yes. Buying in one place and selling in another is normal trading. It's the promises some sellers attach to "arbitrage" products that you should question.
Can a beginner do arbitrage?
In theory. In practice the gaps are tiny and closed by fast firms before most people can act, and costs often eat what's left.
What is triangular arbitrage?
A forex version using three currency pairs. If the three rates don't line up exactly, converting through all three could end with slightly more than you started. Those gaps are usually tiny and gone in moments.
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