Every bull market produces a familiar pattern. As share prices rise, investors become increasingly focused on growth, opportunity and momentum. Businesses that are delivering strong operational performance attract growing attention, while companies exposed to major economic or technological trends often see valuations climb ever higher. At some point, however, a subtle shift occurs. Investors stop asking whether a company is worth its valuation and start asking how much higher the shares can go. History suggests this is one of the defining characteristics of a mature bull market. Valuation does not disappear. It simply becomes less important in the minds of investors.

Bull Markets Reward Optimism

Bull markets are built on improving expectations. Economic conditions strengthen, corporate earnings grow and investor confidence increases. As portfolios appreciate, investors become more willing to take risk and focus on future opportunities. This optimism often creates a virtuous circle. Higher share prices encourage greater confidence. Greater confidence supports higher valuations. Higher valuations reinforce the belief that investors are identifying successful businesses. The longer the cycle continues, the stronger this confidence becomes. Eventually, investors begin assuming that positive trends will persist far into the future.

Recent Success Feels Permanent

One of the most powerful behavioural biases affecting investors is recency bias. People naturally place greater emphasis on recent events than on longer-term history. In a rising market, strong performance feels normal. Continued gains appear inevitable. A company that has delivered several years of revenue growth is expected to keep growing. A sector that has outperformed is assumed to remain a winner. Businesses that repeatedly exceed expectations begin attracting ever-larger levels of confidence. The problem is that markets are cyclical. Strong periods eventually give way to weaker periods, just as weak periods eventually recover. Yet during a bull market, investors often become increasingly convinced that current conditions represent the new normal.

Growth Becomes More Important Than Price

In the early stages of a market rally, investors often pay close attention to valuation. As enthusiasm increases, the conversation begins to change. Rather thasn debating whether a company is expensive, investors focus on how rapidly earnings might grow over the coming years. The questions become:

·        How large is the opportunity?

·        How quickly can the company expand?

·        Can management keep exceeding expectations?

·        How dominant could the business become?

These are important considerations. The danger arises when investors stop asking what is already reflected in the share price. A great company can still be a poor investment if expectations become unrealistic.

Market Winners Create Their Own Momentum

Bull markets often produce a group of dominant performers that attract disproportionate investor attention. As these shares rise, they attract additional research coverage, greater media interest and stronger institutional ownership. Investors who initially avoided them begin questioning whether they have missed an opportunity. The more successful a stock becomes, the more difficult it can feel to ignore. This process can create a feedback loop in which past share price performance becomes part of the investment case itself.Valuation concerns are increasingly dismissed because previous concerns proved unfounded. The stock has risen before, so investors assume it will continue rising.

The Narrative Becomes More Important Than the Numbers

Many successful companies benefit from compelling narratives. Artificial intelligence, healthcare innovation, energy transition, digital transformation and other long-term themes can all provide powerful growth stories. During bullish periods, these narratives often become increasingly influential. Investors focus on future possibilities rather than current constraints. Large addressable markets receive more attention than near-term earnings. Potential future dominance becomes more important than present-day profitability. There is nothing inherently wrong with investing in strong long-term themes. Problems tend to emerge when narratives become disconnected from valuation discipline. A great story does not eliminate the importance of price.

Confirmation Bias Reinforces Optimism

As valuations rise, investors often become more committed to the investment thesis. Positive news receives attention. Encouraging trading updates reinforce confidence. Contract wins, earnings growth and analyst upgrades all support the belief that the market is behaving rationally. Meanwhile, warning signs may receive less attention. Slowing growth rates, increasing competition, margin pressure or stretched valuations are often explained away because they conflict with the dominant narrative. This is a classic example of confirmation bias. Investors seek evidence that supports existing beliefs while discounting evidence that challenges them.

The Cost of Missing Out Becomes Greater Than the Fear of Loss

During bear markets, investors tend to focus on risk. During bull markets, they often focus on opportunity. This shift fundamentally changes behaviour. Instead of worrying about losing money, investors become increasingly concerned about missing gains. Watching a stock continue rising without owning it can feel more painful than paying what once appeared to be an excessive valuation. As a result, valuation discipline weakens. The fear of missing out starts replacing the fear of overpaying. Historically, this transition has been a common feature of speculative periods.

"This Time Is Different"

Few phrases have appeared more frequently in market history. Every major bull market produces arguments explaining why traditional valuation measures no longer apply. New technologies, structural changes, economic developments or competitive advantages are cited as reasons why historical comparisons should be ignored. Sometimes these arguments contain an element of truth. The internet changed business models. Mobile technology transformed industries. Artificial intelligence is reshaping parts of the economy. Yet even transformational changes do not eliminate the relationship between expectations and returns. Companies can achieve remarkable success while still disappointing investors if expectations become too ambitious.

Valuation Matters Most When Nobody Is Looking

One of the great lessons of investing is that valuation often seems least important immediately before it becomes most important. As long as expectations continue rising, expensive stocks can become more expensive. This encourages investors to believe valuation concerns were misplaced. However, when sentiment shifts, valuation can suddenly become the dominant factor. The same investors who focused entirely on growth begin asking questions about earnings multiples, cash flow generation and return on capital. What was previously ignored becomes highly relevant again. Markets often move from optimism to caution much faster than narratives can adjust.

The Discipline of Looking Beyond the Story

Successful long-term investors understand that valuation is not a timing tool. A stock can remain expensive for years. Equally, a cheap stock can remain cheap for years. However, valuation remains an important measure of expectations. The key question is not whether a business is excellent. The key question is whether the market's expectations leave room for positive surprise. Investors should ask:

·        How much future growth is already assumed?

·        What would need to happen for the shares to justify their current valuation?

·        Is success already fully reflected in the share price?

·        Am I buying a business or chasing a trend?

These questions become particularly valuable during periods of widespread optimism.

Conclusion

Investors ignore valuation during bull markets because rising share prices, strong narratives and growing confidence make future opportunities appear more important than present-day pricing. Success reinforces optimism, optimism reinforces demand and demand supports higher valuations. For a while, the process can appear entirely rational. History suggests, however, that valuation never truly disappears. It simply becomes less visible when enthusiasm is strongest. Eventually, expectations and fundamentals reconnect.

Key takeaway: Investors often ignore valuation during bull markets because confidence, momentum and compelling growth stories shift attention towards future potential. Yet valuation remains a measure of expectations, and the higher those expectations rise, the less room there is for disappointment.