Due Diligence

“One of the most powerful sources of mispricing is the tendency to over-weight or over-emphasize current conditions.” – Bill Miller – Investor, fund manager

Bill Miller is a renowned American investor and fund manager, most prominent for his extraordinary tenure at Legg Mason Capital Management where he managed the Value Trust mutual fund. Born in 1950 in North Carolina, Miller graduated with honours in economics from Washington and Lee University in 1972 and went on to serve as a military intelligence officer. He later pursued graduate studies in philosophy at Johns Hopkins University before advancing into finance, embarking on a career that would reshape perceptions of value investing.

Miller joined Legg Mason in 1981 as a security analyst, eventually becoming chairman and chief investment officer for the firm and its flagship fund. Between 1991 and 2005, the Legg Mason Value Trust—under Miller’s stewardship—outperformed the S&P 500 for a then-unprecedented 15 consecutive years. This performance earned Miller near-mythical status within investment circles. However, the 2008 financial crisis, where he was heavily exposed to collapsing financial stocks, led to significant losses and a period of high-profile criticism. Yet Miller’s intellectual rigour and willingness to adapt led him to recover, founding Miller Value Partners and continuing to contribute important insights to the field.

The context of Miller’s quote lies in his continued attention to investor psychology and behavioural finance. His experience—through market booms, crises, and recoveries—led him to question conventional wisdom around value investing and to recognise how often investors, swayed by the immediacy of current economic and market conditions, inaccurately price assets by projecting the present into the future. This insight is rooted both in academic research and in practical experience during periods such as the technology bubble, where the market mispriced risk and opportunity by over-emphasising prevailing narratives.

Miller’s work and this quote sit within the broader tradition of theorists who have examined mispricing, market psychology, and the fallibility of investor judgement:

• Benjamin Graham, widely considered the father of value investing, argued in “The Intelligent Investor” (1949) and “Security Analysis” (1934) that investors should focus on intrinsic value, patiently waiting for the market to correct its mispricings rather than being swayed by current market euphoria or fear. Graham’s concept of “Mr Market” personifies the emotional extremes that create opportunity and danger through irrational pricing.

• John Maynard Keynes provided foundational commentary on the way markets can become speculative as investors focus on what they believe others believe—summed up in his famous comparison to a “beauty contest”—leading to extended periods of mispricing based on the prevailing sentiment of the day.

• Robert Shiller advanced these insights with his work on behavioural finance, notably in “Irrational Exuberance” (2000), where he dissected how overemphasis on current positive trends can inflate asset bubbles far beyond their underlying value.

• Daniel Kahneman and Amos Tversky, pioneers of behavioural economics, introduced the psychological mechanisms—such as recency bias and availability heuristic—that explain why investors habitually overvalue current conditions and presume their persistence.

• Howard Marks, in his memos and book “The Most Important Thing”, amplifies the importance of second-level thinking—moving beyond the obvious and questioning whether prevailing conditions are likely to persist, or whether the crowd is mispricing risk due to their focus on the present.

Bill Miller’s career is both a case study and a cautionary tale of these lessons in action. His perspective emphasises that value emerges over time, and only those who look beyond the prevailing winds of sentiment are positioned to capitalise on genuine mispricing. The tendency to overvalue present conditions is perennial, but so too are the opportunities for those who resist it.