For decades, financial theory has rested on a central axiom: public information is free, symmetric, and quickly incorporated into prices. Under this premise, investors shouldn’t be able to generate sustained returns using data available to everyone. However, a recent study by Ed deHaan, Chanseok Lee, Miao Liu, and Suzie Noh (Stanford and Boston College, 2025) challenges this idea with a compelling experiment: an AI that, relying solely on public data, systematically improves the portfolios of thousands of real-world funds.
Autor: Irrational Investors
EBITDA…¿SÍ O NO?
Durante décadas, el EBITDA ha sido el atajo favorito de muchos analistas para estimar la rentabilidad operativa de una empresa. Pero su uso generalizado ha generado también graves distorsiones: ignora la inversión necesaria para sostener el negocio, puede inflar la percepción de liquidez, y es fácilmente manipulable...
Why Even the Smartest People Make Predictable Mistakes…
Why do even the smartest people make predictable mistakes? Because the trap isn’t in the data — it’s in how we interpret it. Representativeness, availability, anchoring, overconfidence, illusion of control... These aren't flukes. They're systemic biases. Kahneman and Tversky called them out decades ago. Yet we keep falling for them — in investing, in business, in healthcare, in public policy.
ROC, ROIC AND ROE by DAMODARAN
La clave para entender la creación de valor en una empresa no está solo en medir cuánto gana, sino en cuánto gana en relación con lo que invierte y con el coste de esa inversión. Las métricas tradicionales como ROIC, ROE y ROC, aunque populares, deben ajustarse cuidadosamente para eliminar sesgos contables y reflejar fielmente la realidad económica.
LIVE, WORK AND THINK WITH AI
Co-Intelligence, by Ethan Mollick, shows how generative AI is reshaping both personal and professional spheres. Through four heuristic rules and five operational roles, the author provides a practical playbook for boosting individual creativity, critical reflection, and decision making, while warning against blind reliance on language models.
15 ideas about Risk (From against the gods)
"Against the Gods: The Remarkable Story of Risk" is a fascinating book about how humanity has learned to measure and manage risk, enabling advancements in knowledge, the economy, and society by transforming uncertainty into a calculated opportunity.
Contrarians by Choice, Herds by Design
"Be a contrarian." It is the whispered mantra in trading rooms, financial forums, and among many investors who take pride in it. It sounds sophisticated, daring, and hints at the secret to outperforming the market. It evokes images of lone wolves bravely defying conventional wisdom to uncover hidden gems and achieve extraordinary returns. But is this contrarian ideal a true reflection of market reality? Or is it, instead, a more complex and paradoxical dance between individual conviction and collective influence? Every investment decision is simultaneously a contrarian act and an adherence to the herd. Let’s explore this seemingly contradictory truth.
IS GOING TO HAPPEN AGAIN WITH AI?
"Risk comes from not knowing what you're doing" – Warren Buffett's timeless quote is more than just investment advice; it’s a universal truth applicable to any major decision. Uncertainty, fueled by a lack of knowledge, often leads to unpredictable and potentially disastrous outcomes.
Speculation versus Investment: An Increasingly Blurred Frontier
Is the distinction between speculation and investment truly valid, or is it merely a theoretical construct that has been consolidated throughout the history of financial markets? This article examines how, in today’s environment, marked by technological transformations, structural market changes, and a growing understanding of investor psychology, these categories have progressively blurred.
QUALITY GROWTH INVESTING: DOES IT WORK?
Drawing on the principles outlined in Peter Seilern's Only the Best Will Do, it seems evident that quality growth investing represents a refined and resilient approach to wealth creation. By focusing on companies with sustainable competitive advantages, robust financial health, and consistent growth trajectories, investors can achieve superior returns while mitigating risks inherent in volatile markets. Quality growth investing has shown (at least in the last 5 years) that true investing success lies in consistently backing the best.
Irrational Investors 