convergence
Convergence is when the price of a future contract or a discounted asset moves closer and closer to its real, fair value as time runs out.
In plain English
"But why is this future selling above the market price now? Is it not the same maize?" Blessing asked her cousin, who had just started trading commodity futures in Lagos.
"It won't stay that way," he said. "As we get closer to the contract's expiry date, the future price and the market price will meet in the middle. That is convergence."
That is really the whole idea. A future contract is a promise to buy or sell something later, at a price agreed today. But the price of that promise and the price of the actual thing being promised do not always match while there is still time left on the clock. There is room for the two to drift apart because of interest rates, storage costs, or plain market mood.
As the expiry date approaches though, that room shrinks. Nobody wants to hold a contract that says maize is worth ₦850 per bag when everyone can see maize trading at ₦790 in the open market. So traders buy and sell to close that gap, and the two prices converge, sometimes right down to the last day.
You see the same pattern with a discounted bond or a fund trading below its real net asset value. The market price and the true value do not agree at first, but the closer you get to maturity or redemption, the more they line up, like two people walking towards each other from opposite ends of a street.
This matters for anyone trading futures, whether it is a Nigerian farmer hedging his cocoa harvest or someone in London watching oil futures. If you understand that convergence is coming, you know the gap will not last forever, and you can plan your exit before the crowd rushes for the door.
A Nigerian trader buys a maize future contract priced at ₦850 per bag, while the actual market price of maize is ₦790 per bag. With three weeks left before the contract expires, that ₦60 gap slowly narrows each day, until on expiry day both prices settle around ₦800, showing convergence in action.
Questions people ask
Does convergence always happen exactly at expiry?
Yes, by design. A futures contract is settled based on the actual price of the underlying asset at expiry, so any gap between the future price and the spot price must close by that date, otherwise there would be a free profit sitting there for traders to grab, and the market does not usually allow that for long.
Can convergence be used to make money?
Some traders try to profit from the gap itself, buying the cheaper side and selling the pricier side, expecting the two to meet. This is a real strategy, but it needs good timing and an understanding of why the gap exists in the first place, since some gaps reflect real costs like storage or interest, more than market mood.
Is convergence only about futures contracts?
No. The same idea shows up whenever something trades away from its true value but has a fixed date where reality catches up, such as a bond nearing maturity or a fund trading at a discount to its net asset value ahead of redemption.
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