Markets are not instantly efficient. Information spreads slowly, investors hold different convictions and time horizons, and steady flows from index funds and large institutions can keep buying or selling a stock regardless of its value. A strong narrative can hold a valuation far from fair value for years, until a catalyst finally forces the gap to close.
Key takeaways
- Prices reflect who is willing to trade today, not a single agreed measure of fair value.
- Information reaches participants at different speeds, so a mispricing can persist until enough people act on the same fact.
- Index membership and institutional mandates create persistent, price-insensitive flows that can sustain a valuation.
- A dominant narrative can keep a stock expensive or cheap for years until a catalyst changes the story.
- Without an obvious trigger, a gap between price and value can stay open for years.
Does an efficient market not correct mispricing instantly?
The idea that prices always reflect all available information is a useful approximation, not a law that holds at every moment. In practice a price reflects the balance of everyone willing to buy or sell at a given time, and that balance can sit far from any careful estimate of fair value.
For a mispricing to close, enough participants have to reach the same conclusion and be able to act on it. If the people who see the gap are few, are unsure, or lack the capital to move the price, the gap can remain open. Efficiency is a tendency that plays out over time, not a switch that flips the instant new information appears.
Why does information spread so slowly?
A single fact, such as a change in a company's competitive position or the quality of its earnings, does not reach everyone at once. Analysts cover a limited set of companies, smaller firms attract little research, and detail buried in an annual report can take quarters to be widely understood.
Until a fact is broadly recognised, only a handful of investors are pricing it in, and their buying or selling is too small to move a liquid stock much. The mispricing persists not because the information is hidden but because it has not yet been absorbed by enough of the market to shift the overall balance of buyers and sellers.
Open any stock on Artha Terminal to see its valuation, ownership, and long-term trend together, so you can judge whether price and fundamentals have drifted apart.
How do conviction and time horizon keep a gap open?
Even investors who agree a stock is mispriced may not act the same way. One may hold a long horizon and be willing to wait years for a view to play out, while another manages money that is judged every quarter and cannot afford to look wrong for long. Differences in conviction, Holding Period, and tolerance for being early all shape who trades and when.
Betting against a mispricing also carries real cost and risk. Selling a stock you believe is overvalued through Short Selling exposes you to further rises before any fall, and Arbitrage between price and value is rarely free of friction. Because staying wrong is expensive, many rational investors simply step aside, which leaves the mispricing in place.
How do index and institutional flows sustain a valuation?
Large pools of money move for reasons that have nothing to do with a single company's value. When a stock enters an Index such as the Nifty 50, every Index Fund tracking that index must buy it in proportion to its weight, and must keep holding it while it stays in the index. This is price-insensitive demand: the buying happens regardless of whether the stock is cheap or expensive.
Institutional mandates work the same way. A fund restricted to large companies keeps buying the biggest names, and steady SIP inflows into popular funds are deployed into the same set of stocks month after month. These persistent flows can support a rich Market Cap for years, which is one reason index-heavy and widely-owned stocks can stay expensive far longer than their fundamentals alone would suggest.
How does a narrative hold a price away from value?
Markets price stories as much as spreadsheets. A compelling narrative, that a company owns the future of a sector, or that an old business is in terminal decline, can attach a high or low valuation to a stock and keep it there while the story holds. Momentum reinforces this: a rising price attracts more buyers, which lifts the price further, and the same loop runs in reverse for a falling one.
The gap usually closes only when a catalyst breaks the narrative: a run of results that contradicts it, a change in leadership or regulation, or a broad shift in Liquidity and risk appetite. Until then, being right about value is not the same as being paid for it. This is the practical limit behind the point in Why prices fall on good results, that price and reported reality can diverge, and the divergence can last.