arbitrageur
Arbitrageur: someone who buys something cheap in one market and sells it dear in another, pocketing the gap before it closes.
In plain English
Think of the woman at the border market who buys bags of rice on the Benin Republic side where they are cheaper, then carries them across to sell in Lagos where the same rice fetches a better price. She is not growing rice or manufacturing anything, she is simply spotting that the same product costs different amounts in two places, and moving fast enough to profit from the difference before everyone else notices and the prices even out. That is exactly what an arbitrageur does, except usually with shares, currencies, bonds or other financial instruments instead of rice bags.
In the stock market, an arbitrageur might notice that shares of a company listed on both the Nigerian Exchange and a foreign exchange are priced slightly differently once you convert currencies. They buy where it is cheap and sell where it is dear, almost at the same time, locking in a small but nearly guaranteed profit. In London, a trader might do this with a stock dual listed in London and New York, watching prices in both cities the way a trader in Lagos might watch parallel market rates against the official rate.
The profit per trade is often tiny, sometimes just a few kobo or a few pence per share, but arbitrageurs make up for it with volume and speed. They need quick information, low transaction costs and the discipline to act the moment they see a gap, because these gaps rarely last. Other traders are watching too, and the moment enough people jump on the same opportunity, the prices converge and the window closes.
Arbitrage is one reason markets tend to stay fairly efficient. When someone is always ready to profit from price differences, those differences get squeezed out quickly, which keeps prices honest across different markets and exchanges.
A stock trades at ₦82 on the Nigerian Exchange and its equivalent value, once converted, works out to ₦85 on a foreign exchange. An arbitrageur buys a large batch at ₦82 in Lagos and sells the equivalent abroad at ₦85, making about ₦3 per share before costs, across thousands of shares at once.
Questions people ask
Do I need a lot of money to be an arbitrageur?
Usually yes, because the profit per unit is small, so arbitrageurs trade in large volumes to make the effort worthwhile, and they also need fast access to information and low cost trading accounts.
Is arbitrage risky?
It is lower risk than most trading strategies because the profit is locked in almost immediately, but it is not risk free, since prices can move before both sides of the trade complete, or costs can eat the profit.
Can an ordinary Nigerian investor practise arbitrage?
It is difficult without fast tools and large capital, but understanding the idea helps you appreciate why prices for the same asset rarely stay different for long across markets.
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