Financial markets are often driven less by what is happening today and more by what investors expect to happen in the future. Understanding those expectations can be crucial for determining whether a stock is attractively valued or already priced for perfection.

Legendary investor Bill Miller captured this idea with a powerful observation: “Markets are all about expectations, and the critical question for investors is always, what is discounted? Are the expectations reflected in market prices too high, or too low?”

Markets Are Forward-LookingStock prices typically reflect expectations about a company’s future earnings, growth prospects, cash flows and risks. As a result, by the time positive news becomes widely known, investors may have already incorporated it into the stock price.

This is why a company can report strong earnings and still see its shares decline. If the market had anticipated even stronger results, the actual numbers could be viewed as disappointing.

Conversely, a company delivering weak results can sometimes see its stock rise if performance turns out to be better than investors had feared. What Is Already Priced In?

Miller’s observation highlights an important distinction between analysing a business and analysing its stock. A strong company does not necessarily mean its shares are a good investment.

If investors already expect exceptional growth and the stock trades at a very high valuation, there may be limited room for further upside. Investors therefore need to ask two separate questions: How good is the business, and how much of that success is already reflected in the share price?

Expectations Can Drive Market SurprisesThe gap between expectations and reality can create significant investment opportunities. When expectations are extremely pessimistic, even a modest improvement in earnings or business conditions can lead to a sharp re-rating of a stock.

Similarly, when expectations are excessively optimistic, even strong results may fail to satisfy investors. This dynamic is particularly important during periods when valuations are elevated and markets are highly sensitive to changes in earnings forecasts, interest rates and economic growth.

Valuation Remains CrucialThe quote also underlines the importance of valuation discipline. Investors can become attracted to stocks because of strong growth stories, popular market themes or impressive earnings momentum.