Episode Summary
Executive Summary: Howard Marks argues that decision quality cannot be judged by outcome alone because luck and missing information heavily influence results. Using gambling games as analogies, he explains that investing is a probabilistic activity requiring discipline, sizing bets by edge, and focusing on price/proposition rather than simply picking winners. He concludes that great investing, like great poker, means thinking in bets under uncertainty.
Main Topics: Decision quality vs. outcome (Priority: 5/5): Marks opens with the idea from Jack Grayson that you cannot infer the quality of a decision from its result, because random outcomes and missing information can make good decisions fail and bad decisions succeed. Personal history with games and gambling (Priority: 3/5): He describes a lifelong attraction to card games, bridge, backgammon, blackjack, and gin, using them as practice grounds for probabilistic thinking and judgment. Taxonomy of games: information, luck, skill (Priority: 5/5): Marks distinguishes games by whether information is hidden, whether luck matters, and whether skill matters, then maps chess, roulette, poker, blackjack, and backgammon onto that framework. Investing as a game of uncertainty (Priority: 5/5): He argues that active investing resembles poker and blackjack more than chess because it involves hidden information, luck, and skill, while index investing is mostly a beta activity with little room for skill. The importance of the proposition, not just the favorite (Priority: 5/5): Success depends not only on identifying the likely winner but on whether the odds or price are favorable enough; investing requires buying assets at attractive prices relative to risk and reward. Market efficiency and alpha vs. beta (Priority: 4/5): Marks contrasts markets where skill can add value (alpha markets) with highly efficient ones where returns largely reflect market exposure (beta markets), explaining the rise of passive investing. Process, discipline, and betting size (Priority: 5/5): He emphasizes circle of competence, selective participation, emotional control, second-level thinking, and scaling bets up when the edge is large and down when it is small.
Key Arguments: A decision can be excellent even if it loses, because outcomes are shaped by luck and incomplete information. The best decision-makers are those with the best process and judgment, not merely the best track record. Games differ materially by hidden information, luck, and skill; these dimensions determine whether skill can matter. Investing, especially active investing, includes hidden information, luck, and skill, making it more like poker/blackjack than roulette/chess. Index investing requires little or no skill because it merely tracks a benchmark and largely inherits market returns. In markets, identifying the favorite is not enough; one must also assess whether the price/odds create a favorable proposition. Buying good companies is not the same as buying good investments; price determines whether the proposition is attractive. Superior investors exploit mispricings and know when to bet big, but also when to sit out and preserve capital. Emotional discipline matters because greed, fear, hope, and chasing can lead to overbetting and poor decisions. Thinking probabilistically helps investors accept uncertainty and avoid judging decisions solely by hindsight.
Data Points: Grayson book year: 1963 - Marks first read Decisions Under Uncertainty as a Wharton freshman in 1963. Jackson Grayson role year: 1971 - Grayson later became price czar in the Nixon administration. Howard Marks age: 17 - He says the lesson about decision quality profoundly influenced him as a 17-year-old. Backgammon dice probabilities: 7 occurs 16.7%; 12 occurs 2.8% - Marks cites exact roll probabilities to illustrate predictable odds in backgammon. Blackjack credit line requested: $25,000 - Rick Kane asked a casino host to arrange a credit line for Marks. Average bet mentioned: $11 - The casino host declined the $25,000 line because Marks’ average bet was only $11. Nifty Fifty holding period: 5 years - Marks says buying the Nifty Fifty on arrival in 1968 and holding for five years lost almost all money. Average annual default rate: about 4% - Marks says roughly 4% by dollar amount of high-yield bonds defaulted each year on average. Poker session loss rate: over 40% - A great poker player can still be losing over 40% of the time after eight hours of play. Backgammon doubling threshold: 25% winning chance - A backgammon player should accept a double if his win probability exceeds 25%. Odds example: 2-to-1, 6-to-5, 4-to-1 - Marks uses these to show when a favorite or underdog becomes the better bet.
Pivotal Quotes: "you can't tell the quality of a decision from the outcome" — Howard Marks: Marks recalls the central lesson from Jack Grayson’s book as the foundation of his decision-making philosophy. "The goal isn't to figure out who the favorite is and bet on it. Rather, the goal is to figure out who the favorite is and whether the odds are fair or not." — Howard Marks: This is his core gambling-to-investing analogy, emphasizing proposition over mere winner-picking. "Success in investing doesn't come from buying good things, but from buying things well" — Howard Marks: Marks summarizes his experience with the Nifty Fifty and high-yield bonds.
Implications: Listeners should judge decisions by process, not outcome, and focus on price, probability, and sizing. For investors, durable success comes from probabilistic thinking, selective action, and exploiting mispricings rather than chasing popular winners.
About The Memo by Howard Marks
On October 12, 1990, Oaktree Co-Chairman Howard Marks published his first memo to clients. In the decades since, he has periodically released memos reflecting his viewpoint on the investment landscape, as well as more general business insights. On this podcast we'll hear the latest memos by Howard, released in tandem with or shortly after their publication.