The trading floor of the New York Stock Exchange in 1966 was a far cry from today’s hyper-efficient, algorithm-driven markets. Back then, investing was largely an art form, relying on intuition, seasoned judgment, and the belief that skilled individuals could consistently outmaneuver the collective wisdom of the marketplace. However, a seismic shift was brewing, originating not on Wall Street, but within the hallowed halls of academia at the University of Chicago. A group of forward-thinking economists, armed with emerging computational power and a willingness to challenge established dogma, began to lay the groundwork for what would become the foundation of modern investment theory, fundamentally altering how individuals and institutions approach wealth creation and risk management.
This intellectual upheaval, chronicled in Errol Morris’s documentary "Tune Out the Noise," centers on the development and practical application of radical ideas that redefined the very fabric of financial markets. The film revisits the 1960s and early 1970s, a period marked by a confluence of technological advancement, a burgeoning data revolution, and a growing skepticism towards traditional investment practices. The core tenet that emerged from this era was the Efficient Market Hypothesis (EMH), a concept pioneered by Nobel laureate Eugene Fama. The EMH posited that asset prices, in a well-functioning market, already incorporate all available information. Consequently, the idea of consistently "beating the market" through stock picking or market timing was rendered improbable, if not impossible. Instead, the focus shifted from individual stock selection to a more systematic approach centered on broad diversification and disciplined risk management.
The timing of these groundbreaking ideas was no coincidence. The 1960s witnessed the dawn of the computational age, granting investors unprecedented access to historical price data and company financials. This availability of information allowed for rigorous empirical analysis, moving investing from the realm of gut feelings and anecdotal evidence towards a more scientific discipline. The prevailing wisdom, which emphasized the unique stock-picking prowess of professionals, began to erode. As Fama himself articulated, "Markets work; prices are right." This meant that while outperforming the market on a consistent basis was unlikely, investors could still achieve success by embracing the market’s inherent efficiency. This philosophy paved the way for the rise of passive investing, a strategy that seeks to mirror market performance rather than attempt to surpass it.
Aaron Brask, a seasoned Wall Street professional and finance lecturer at the University of Florida, emphasizes the amplified relevance of these principles in today’s environment. "Markets were not as efficient when Eugene Fama published his seminal work in the 1960s," Brask observes. "If they were, it would imply that legendary investors like Warren Buffett, Charlie Munger, Walter Schloss, Philip Fisher, and Seth Klarman were merely fortunate. Today, an immense concentration of capital, intellectual talent, and computational power is dedicated to uncovering investment opportunities. This intense competition makes outperforming the market significantly more challenging. The pool of less informed capital has shrunk, leading to demonstrably more efficient markets."
Fama’s theories, coupled with the technological advancements of the era, directly spurred the development of the index fund. These investment vehicles, designed to track a specific market index like the S&P 500, offered a low-cost, diversified alternative to actively managed funds. Wells Fargo introduced the first index fund in 1971, followed by John Bogle’s creation of the first index mutual fund accessible to individual investors in 1976. Bogle, a visionary in the field, would later become synonymous with low-cost, passive investing. While the efficacy of passive investing remains compelling for the majority of investors, Brask acknowledges that a select group of active managers continue to demonstrate the ability to outperform. "Buffett and other value investors," he explains, "calculate a stock’s intrinsic value based on its fundamental financial health. They then compare this intrinsic value to its current market price. Value investing, in essence, involves purchasing stocks at a significant discount to their perceived worth. In certain instances, superior or growing fundamental metrics may justify higher valuations."
A cornerstone of the Chicago School’s contribution to modern finance is the profound emphasis on diversification. Whereas earlier investment strategies often focused on identifying a single, high-conviction winner, the University of Chicago researchers championed the opposite approach: spreading investment across a broad range of assets. Their findings indicated that by combining the stocks of established, stable companies with those of smaller, high-growth potential firms, investors could mitigate volatility without necessarily sacrificing potential returns. This principle became the bedrock of Modern Portfolio Theory (MPT), a framework that continues to guide investment decisions globally. Early proponents of MPT, such as David Booth and Rex Sinquefield, went on to establish Dimensional Fund Advisors (DFA). DFA effectively translated academic theory into a highly successful investment management business, leveraging the EMH to construct diversified portfolios for its clients.
Booth is a prominent figure in Morris’s documentary, which, by virtue of DFA’s involvement as a backer, occasionally adopts a promotional tone. However, Morris, an Oscar-winning filmmaker renowned for his nuanced approach, handles the subject matter with his characteristic subtlety. His interview style, marked by deceptively simple yet probing questions, allows the narrative to unfold organically. The film explores how the field of finance transitioned from relying on intuition to embracing evidence-based methodologies. Matthew Garrott, Director of Investment Research at Fairway Wealth Management, a US-based wealth management firm, found the film’s focus on the human element particularly impactful. "The academics interviewed were portrayed as humble and relatable," Garrott commented. "It was insightful to hear these titans of finance discuss their work in their own words."
The documentary also highlights the significant role of randomness and chance in shaping both markets and the careers of the individuals involved. Financial markets are inherently complex and dynamic systems, susceptible to unpredictable events and behavioral patterns that defy purely rational explanation. The convergence of brilliant minds at the University of Chicago, who spearheaded the passive investment revolution, was itself a product of serendipity, though the university’s esteemed reputation in economics undoubtedly played a role in attracting such talent. The establishment of the Center for Research in Security Prices (CRSP) by economist James Lorie in 1960 proved to be a pivotal moment. CRSP provided researchers with access to an extensive trove of historical stock and bond data, creating a fertile ground for the intersection of financial theory and technological innovation.
Individual trajectories were also significantly influenced by fortunate circumstances. Eugene Fama nearly missed his opportunity to study at the University of Chicago, securing a last-minute scholarship that irrevocably altered his career path. Myron Scholes, another Chicago alumnus and Nobel laureate who championed early forms of computerized trading, stumbled into financial data analysis almost by accident. In 1963, he accepted a programming role with limited prior experience. When the other programmers failed to materialize, Scholes found himself assisting academics with financial research, a fortuitous turn of events that launched his distinguished career.
The partnership between David Booth and Rex Sinquefield, who transformed academic theories into a tangible investment enterprise with the founding of Dimensional Fund Advisors, is another testament to the role of luck. In 1969, Booth narrowly avoided conscription into the Vietnam War when a deferment allowed him to pursue his PhD at the University of Chicago. Sinquefield, who served in the army, was spared combat duty due to poor eyesight. Today, DFA manages nearly $800 billion in assets, and the University of Chicago’s prestigious business school bears Booth’s name.
Despite the profound impact of these theories, the documentary acknowledges that the financial landscape remains imperfect. Critics argue that the very intellectual revolution that democratized investing also inadvertently contributed to market excesses. The EMH, while elegant, has been accused of fostering an overconfidence in market infallibility, potentially leading investors and regulators to underestimate the risks associated with asset bubbles and the necessity of robust oversight. Some scholars posit that the very success of passive investing has, paradoxically, diminished market efficiency, leaving a smaller contingent of active participants to incorporate new information into asset prices.
Proponents, however, maintain that the core tenets of the EMH still hold considerable validity. Robert Jarrow, an advisor at SAS and Professor of Investment Management at Cornell University, asserts, "Numerous skilled traders exist, and behavioral biases are as prevalent today as they have been in the past. Consequently, the influence of irrational traders on market efficiency remains consistent. Furthermore, it can be demonstrated that asset bubbles are indeed compatible with efficient markets." He elaborates, "Markets exist on a spectrum of efficiency, ranging from less efficient to highly efficient. Markets with frequent trading activity, such as those for U.S. large-cap stocks, tend to be more efficient. The market for selling a private residence, by contrast, is significantly less efficient. While the U.S. stock market may not be perfectly efficient, it is sufficiently so that active managers face a substantial disadvantage."
The mathematical models underpinning many investment strategies have also faced scrutiny. The Black-Scholes model, a significant contribution by Scholes to financial economics, provided a sophisticated framework for risk management and portfolio diversification. While a theoretical triumph, it also became instrumental in the proliferation of speculative trading in derivatives. Intended as a hedging tool, derivatives evolved into highly leveraged instruments, amplifying risk through complex interdependencies. This financial innovation generated substantial profits for traders but also contributed to market instability, culminating in the 2008 global financial crisis. As one observer noted at the time, the model became "an ingredient in a rich stew of financial irresponsibility, political ineptitude, perverse incentives, and lax regulation."
Ultimately, "Tune Out the Noise" transcends a mere examination of financial theory. It offers a poignant reflection on a particular era of American ingenuity and its capacity for self-examination, a quality that some argue is diminishing. The concept of passive investing, which entails accepting market-average returns, was, as Rex Sinquefield wryly observes in the film, not initially perceived as "the American way," yet it eventually gained widespread acceptance. David Booth’s personal narrative further illustrates this tension. A former shoe salesman, Booth recalls a desire to "feel good about myself" when he returned home at night. His words evoke a sense of an older America that valued diligence, integrity, and modest achievement, a stark contrast to the speculative fervor surrounding contemporary phenomena like cryptocurrency trading and the pursuit of instant wealth.
At its heart, the film delves into the pervasive nature of information in the modern age – the overwhelming volume of data, the promise of efficiency, and the enduring human struggle to discern meaningful signals from the pervasive noise. The Efficient Market Hypothesis is predicated on the assumption that data is an objective and truthful arbiter. However, in an era of high-frequency algorithmic trading, this certainty feels increasingly fragile. Markets now operate at speeds dictated by machines, and the ascendancy of artificial intelligence systems poses an existential threat to traditional active management. "Tune Out the Noise" leaves viewers with a lingering sense of unease, a reminder that even the most meticulously constructed rational systems are built upon inherently human assumptions, and that the next paradigm shift in investment may involve a rediscovery of human judgment.
