Three things define liquidity, and each one answers a different question.
Volume is the easiest to find and the easiest to misread. It is the number of shares that changed hands over a period, usually a day. A stock on the Nigerian Exchange that trades 2,000 shares a day is not liquid in any useful sense, even if its share price looks stable on a chart. Low volume means few people are transacting at the quoted price, which means that price has not been tested by much real buying or selling. A quote with no weight behind it is an opinion, not a fact.
Spread is the distance between the best bid (what a buyer is offering) and the best offer (what a seller is asking). On a heavily traded stock the spread may be a single tick, a rounding error against the share price. On a thinly traded one it can be far wider, and that gap is a real cost. If a stock's best bid is ₦18.00 and its best offer is ₦19.50, a holder who needs to sell now, not wait for a better bid to appear, is selling into the ₦18.00 side. The ₦19.50 "quote" seen on a screen was never available to them.
Depth is what sits behind the bid and the offer: how many shares are actually on offer at each price level, and how many more sit just behind it. This is the part a simple price chart hides completely. A stock can show a last price of ₦19.50 on a trade of 100 shares, while the next best bid sits at ₦16.00 for anyone trying to sell 50,000 shares. In that case the quote reflects a small, easy trade. It says nothing about what happens once a seller tries to move real size.
Put these together and the case against trusting a quoted price in isolation is straightforward. Say an investor holds 100,000 shares of a stock last quoted at ₦20.00, implying a paper value of ₦2,000,000. If the order book shows bids of 5,000 shares at ₦19.80, 10,000 at ₦19.00, and 20,000 at ₦17.50, with nothing substantial beneath that, those three levels absorb only 35,000 shares, at a blended price of about ₦18.26. The other 65,000 shares have no visible buyer at all. The ₦2,000,000 figure on the account statement was never achievable in one sale. That is not a flaw in the stock. It is what thin depth looks like when it meets a real order.
This is the reason I treat the quoted price of a low-volume stock as a ceiling, not a value. It tells you the best possible outcome for a very small trade, placed by someone with no urgency. It does not tell you the outcome for a holder who needs to exit a full position in a reasonable window. The two can diverge sharply, and the divergence grows with the size of the holding relative to the stock's daily turnover.
Liquidity risk shows up most clearly in small, rarely traded names, where a trade is an occasional event rather than part of a continuous market. A stock that trades heavily every day behaves very differently from one that trades a few hundred units once or twice a week. Both can carry a quoted price. Only one of those prices reflects something a holder could reliably act on.
No closing price shows the achievable sale price for a specific stock on a specific date. That number has to be built from the order book at the time. Anyone assessing a position in a thinly traded name needs to look past the headline quote to the order book itself: how many price levels are stacked behind the best bid, and how much volume sits at each one. Where that depth data is not published or not accessible, the honest position is to say the achievable price is unknown, not to assume the quote stands in for it.
The broader point holds regardless of the specific name or exchange. Price is what the last trade said. Liquidity is what the next trade will cost. For anyone holding a stock that rarely trades, the second number matters more than the first, and it is worth checking before the first one is mistaken for a given.
Stockology tracks the Nigerian and wider African markets in one place. Join the waitlist for updates as new features ship.