Lebron

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Lebron is a recurring person in the Astral Codex Ten archive, appearing 2 times across 2 issues between July 21, 2023 and January 21, 2026. The archive places it in contexts such as “Lebron’s first law states that we must know ourselves and our motivations for trading before we trade”; “Like Paul Graham, Lebron encourages us to keep our identities small”; “Lebron is meticulous in the ways that he thinks about risk”. It most often appears alongside Apple, Sam Bankman-Fried, 2008 Financial Crisis.

Metadata

  • Category: People
  • Mention count: 2
  • Issue count: 2
  • First seen: July 21, 2023
  • Last seen: January 21, 2026

Appears In

Source Context

Recovered passages from the original issue text. When the raw archive preserved outbound links inside the source passage, they are listed directly under the quote.

July 21, 2023 · Original source
Tales of Icarus flying too close to the sun, where readers revel in schadenfreude, e.g., When Genius Failed. With The Laws of Trading, Agustin Lebron has written something different: part love letter to trading, part philosophical treatise on epistemology and modeling the world around us, and part guide to applied decision-making. Lebron’s Laws are Laws of the Jungle, not Laws of Nature. He views financial markets as the most competitive Darwinian environment on Earth, where participants must adapt or die. According to Lebron, the book is for people working in finance and trading, as well as anyone in the business of making rational decisions. This explicitly rationalist bent is similar to Julia Galef’s The Scout Mindset or Annie Duke’s Thinking in Bets. Where The Laws of Trading sets itself apart is with the best description of financial market dynamics that I’ve ever seen while diving deep into philosophical concepts. Why trust Lebron? He is an engineer, worked as a quantitative trader and researcher at Jane Street, and has a deep understanding of trading. He has what Taleb would describe as skin in the game. You and I may read Astral Codex Ten in our spare time, post on LessWrong, and navel gaze about our epistemic certainty, but at the end of the day most of us are pursuing rationality for fun, as a hobby. Traders like Lebron pursue rationality as a profession: Their livelihood depends on having a better model of the world than their competition. There are lessons to learn from them that apply to our daily lives. 1: Motivation Know why you are doing a trade before you trade. “What is trading about? Fundamentally, it’s about the relationship between you and the rest of the world.” Right now, you’re making a trade. You’re trading your time to read this book review. You have a cost: you could be spending time with your loved ones, exercising, working, sleeping. You might be hoping to learn something, to take away lessons that you can apply to your life, or simply to entertain yourself. Here, off the bat, are two key insights: We are all making trades, all of the time.
We need a framework for thinking about these trades. Lebron’s first law states that we must know ourselves and our motivations for trading before we trade. We tell ourselves many stories, but someone with intellectual honesty – the person with the most alignment between their motivations and actions – will take money from the person who didn’t go through the work to understand their own motivations. There is a reason that Citadel and other hedge funds pay millions of dollars to trade with retail. They know why they are trading: to maximize profit. And the dilettante who “trades for fun” will be eaten alive by a firm with a much better model of a) the world and b) the dilettante themself. Why did I write this book review? To test my intellectual mettle. I could easily have posted this book review elsewhere, but no, I wanted to see how I stack up against other ACX Book Review contest participants. Similarly, this is often the reason people get into trading. One motivation that Lebron explicitly calls out is intellectual validation. You can toil in obscurity for years as an academic. But in trading, there is a quick feedback loop. If your P&L showed $10M last year and the guy sitting next to you showed $8M, you have demonstrated who is “cleverer” and established a clear hierarchy. What lessons here transfer to our daily lives? Like Paul Graham, Lebron encourages us to keep our identities small. He gives the standard decision-making advice to write down your framework and reasoning for why you made a decision at a specific point in time, in order to avoid biases after the fact. This section of the book contained good general advice, but nothing that will be particularly new for the median ACX reader. 2: Adverse Selection You’re never happy with the amount you traded. Now we start to get into the good stuff. Financial markets are an information aggregation mechanism, relying on multiple parties’ beliefs and recursive Bayesian updates of an individual actor’s beliefs based on the beliefs of others2. Market mechanics demonstrate Bayesian beliefs in action. The following quote is quite long, so skip over it if you don’t want to dive deep into the psychology of making a market. I retained it in full because this is quite literally the best description I’ve ever seen of the Bayesian dance between two market makers: “You are a market maker in South African mining companies. Through years of effort and continual improvement, you have built a trading model for the company Veldt Resources. You walk into work one day, ready to set up your trading for the day. It's a stock that doesn't trade much, and usually there are only two market makers: you and another (we'll call her Jo). She's sharp, and she competes well to trade against customer orders that come in. Your model has Veldt valued at 54.35 ZAR (South African rand). You're going to start quoting the stock, so you're about to turn on your machine making a market 54.25 - 54.45 (1000x)3. Before you turn on, you check the current market and notice that Jo has already turned on and she's making her market 53.50 - 54.00 (2000x). If you were to turn on your machine, your market would cross her market, and you would buy 1000 shares from her for 54.00. You now need to make a decision. Whose model do you believe more, yours or Jo's? If you believe yours, you should turn on your machine, trade at 54.00, and expect to make money. If you believe Jo's model, you should adjust your own model parameters to match her market and turn on, making a similar market to hers. What to do? As with many dichotomies, this is a false one. And as with many decision processes, Bayesian reasoning lights the way… …Jo presumably believes Veldt is worth around 53.75 (the average of her bid and offer). But how confident is she in her belief? The width of her market can give you a clue. It's 0.50 ZAR, whereas yours was going to be 0.20 ZAR wide. All other things equal, you should think that Jo only has 40% (0.20/0.50) of the confidence in her fair value as you do in yours. On some absolute scale of confidence, you can say you had a belief-strength of 100 in your fair value of 54.35 (before seeing Jo's market), and Jo has a belief-strength of 40 in her fair value of 53.75 (before seeing yours). And it turns out the weighted average of these two beliefs is quite a reasonable way to combine them: 100/140 * 54.35 + 40/140 * 53.75 = 54.18. Your updated fair value, having seen Jo's market, is thus 54.18 ZAR. This procedure is a quick, heuristic, and reduced version of Bayesian belief-updating, and a good reference on the subject is A.L. Barker's 1995 paper. After updating, you now believe that the stock is worth 54.18. Assuming your trading costs, risk limits, and return requirements are satisfied, buying 1000 shares for 54.00 is a good trade. Naively, you might just put out a 54.00 bid for 1000 shares, trade with half the 2000 share offer, and hope to collect your expected-value ZAR. In practice, however, you might be able to make even more. If Jo is making a 0.50 wide market, maybe she'd be willing to sell lower than 54.00. It's conceivable that if you put out a 53.90 bid for 1000 shares, Jo will sell at that price, and you collect an extra 100 ZAR! Of course, Jo could react differently. She could see your bid and use that information to change her market, in much the same way you did before turning on. These are difficult decisions, ones where experience with the product and the market make a big difference in being able to eke out a little extra edge. Let's play it safe however and pay 54.00 for 1000 shares. You trade, and Jo reacts by immediately canceling her market. This is not an uncommon occurrence in illiquid stocks, especially in emerging markets, so you're not too surprised. You wait a couple of minutes, mentally visualizing Jo in front of her six monitors, evaluating her trade and her model. Finally, she turns back on. Her new market is 53.50 - 54.05 (10000x)! You reason that Jo has seen that someone (you) disagrees with her valuation of the stock. Jo is a good Bayesian like you, and so she has incorporated that information into her model and updated her beliefs about the fair value of the stock. Her updated belief is that she now wants to sell even more stock, at a marginally higher price. Clearly, she almost entirely discounts the information you've communicated to her with your trade. How should you react? It seems fairly clear that, assuming Jo is not a crazy or incompetent market maker (usually a fair assumption), your trade was a bad one. You bought 1000 shares, when in retrospect, you would have wanted to buy much less, probably zero. Imagine instead that Jo had turned back on with a market of 54.00 - 54.50 (1000x). Her reaction now clearly indicates the information you gave her with your trade is valuable, and she has adjusted her beliefs accordingly. Your trade was probably a good one. Don't you wish you had bought all 2000 shares on offer? No matter what Jo's reaction is, you will be unhappy with your trade. Note that Jo will be unhappy too, since retrospectively she should have either made her initial market bigger or smaller. Welcome to the joyous world of trading!” Whether or not you make money, you have regrets! If you profited, you could have made more. If you lost money, you shouldn’t have made the trade at all. Like death and taxes, you can’t avoid adverse selection. Lebron continues to highlight a few areas of trading that have adverse selection problems. First, IPOs. If you buy the stock in an IPO, you expect the share price to “pop” on the first day of trading. However, if others also have this expectation, the round will be oversubscribed. You can only get the quantity of shares that you bid for when the market doesn’t think the shares will go up. So if you are able to get the shares that you want, the IPO is likely a dud. See also: Venture Capital fundraising. Second, powerful entities that change the rules of the game while you’re playing. Exchanges nullify “erroneous” trades. Brokerages limit buying. Anyone who tried to buy GameStop stock on Robinhood on January 28, 2021, knows this form of adverse selection all too well. Lebron also highlights “special trades”, in which you should throw the “normal rules” out of the window. This advice generalizes to other areas of life: “The normal rules do not apply. If you remove yourself from our usual routine, if you think hard and clearly about the specific situation, maybe you can do something good. Perhaps even great. Others will be paralyzed by inaction, but perhaps you won’t be. Crises can be opportunities.” 3: Risk Take only the risks you’re being paid to take. Hedge the others. In trading, as in life, you can make the right call in expected value terms but still lose due to randomness. Some of that randomness is avoidable. Some of it is not — and can be accounted for by hedging. Here, Lebron encourages us to rely on multiple risk measures and actively seek to understand the risks that we might be subject to. That’s all well and good in the world of finance, with derivatives contracts. But how might this apply in other areas of life? If you work for a publicly traded company and are compensated in stock, sell your shares as soon as you receive them. This is not because I don’t expect the share price of Microsoft/Meta/Apple/etc. to go up. The stock may very well outperform the market. But you are not being compensated for the added risk that you take on here. Your employment prospects at Microsoft/Meta/Apple/etc. are highly correlated with the share price. When the share price is down is when layoffs happen. Former Enron employees can chime in here. Similarly, it makes sense to hedge anything that is outside of your control. Let’s say you’ve decided the crypto bear market of 2023 is a great time to start a new crypto company. Your success depends on things within your control, such as: Your idea
Etc. It might make sense to short the overall tech sector or a basket of publicly traded crypto-related companies so that your trade of time and foregone income to start your new crypto company is associated with only the risks you can control. But some risks you can’t hedge. These are the more interesting ones. There is counterparty risk (your trading partner blows up), liquidity risk (the market you used to hedge dries up), or even political risk: “Living in the developed world, it’s easy to fall into the seductive assumption that the rule of law applies strongly everywhere. This is far from the case. A foreigner trading in an emerging market is frequently among the first “victims” of any political turmoil.” Lebron is meticulous in the ways that he thinks about risk. He highlights that in the markets, you need to be exceedingly paranoid to survive: “Certainly, the modern compendium of mental illnesses (DSM-5) takes a dim view of people who think everyone is out to get them. Yet financial markets are different: people really are out to get you, after all.” I don’t think enough people consider risk and the hedges you can take in the context of a career. I’ve spent the past several years working at startups, where I’ve placed a hugely levered career bet. I’m trading my time and the opportunity cost of another job to work at my current employer. My salary, stock options, expertise, and social capital that I build from working 10 hours per day is fundamentally long (and has risks associated with): The tech industry
January 21, 2026 · Original source
I have seen people try to walk this back by saying Adams only meant they would be persecuted in some way that was metaphorically equivalent to hunting, but I feel like “good chance you will be dead within the year” is saying he means the kind of hunting which literally kills you, and “police will stand down” means that it will be the sort of extremely illegal thing that police would normally react to. I have seen other people try to link this to examples of Republicans actually getting killed, such as Charlie Kirk. But Adams was telling his readers there was “a good chance” that “they” would be dead within a year, which I think implies this fate happening to a significant proportion of ordinary Republicans, not just one prominent person. Also, Kirk was five years after the comment was posted. Can we dismiss this as a joke? I think Adams has used the manipulation technique of saying things that might or might not be jokes and then strategically sticking to them or saying “What? Me? I was only joking! Haha! You can’t take a joke!” depending on which was more convenient to him at that exact second, enough times that I’m not comfortable letting him have that escape. Also, when I was replying to Joel Pollak about this, I happened to glance at his Twitter account, and one of the top tweets was a repost of someone saying that “The Democrat playbook is to arrest every single person who disagrees with them”. I think if I forced Pollak into some kind of extremely literal frame of mind - maybe asked him to bet money on whether I could tweet the words “the Democrats are wrong about immigration” in my Democrat-controlled state without getting arrested - he would admit that, okay, they don’t want to arrest literally every single person who disagrees with them. He was exaggerating for effect, probably in much the way he’s going to say that Scott Adams was exaggerating for effect. You say stuff like “The Democrats are going to HUNT YOU DOWN and LITERALLY MURDER YOU. They will TORTURE YOUR FAMILY and RAPE YOUR DAUGHTER and EAT YOUR PETS and TURN YOUR HOUSE INTO A CHURCH OF SATAN”, and what you mean is “I disagree with the Democrats and sometimes they go overboard cancelling people”. I have a post called If It’s Worth Your Time To Lie, It’s Worth My Time To Correct It. My thesis is that tolerating claims of “directional correctness” - the thing where someone asks to get a pass because even if they said wasn’t literally true, it “points to” an “emotionally correct” thing - is eventually totally corrosive. It means everyone ratchets up their claims to the highest level they think they can get away with (ie walk back later if challenged, as a motte and bailey). And then you end up with this miasma where maybe 5% of people totally believe you, and 50% of people sort of absorb the connotation and think something like that is true, and then people get terrified of the Democrats and think of them as monsters and treat politics as an existential struggle where they will genuinely get arrested or murdered unless they do it to the Democrats first, and then you get a civil war or something. I think Adams and Pollak’s milieu has in fact reached this point, and their love for these kinds of exaggerations is a big part of the cause. Adams was one of the funniest people in the world. If he was actually telling a joke, you could tell by the fact that you were laughing hysterically. “Democrats will hunt and kill you” isn’t funny. I’ll refrain from judgment about whether it was Adams’ sincerely held belief, some kind of annoying manipulation attempt, or whether Adams even recognized a difference between the two. But I think judging him on the fact that it didn’t happen is completely within bounds. … 3: Comments On The Substance Of The Piece … Zanzibar BuckBuck McFate writes: This business where boomers are tolerant of contradictions and find them amusing whereas millennials are horrified is a dynamic I've noticed as well, it seems to be true in politics also, I myself feel this hunger to be authentic all the time. I think it has something to do with the difficulty children have in putting negativity in context. They can't distinguish between a parent having a bad day and venting, or having an existential crisis. So the 50s guy was half right - you don't have to love your boss in your heart of hearts but careful what you say to your kids. Feral Finster writes: » “This is the basic engine of Dilbert: everyone is rewarded in exact inverse proportion to their virtue. Dilbert and Alice are brilliant and hard-working, so they get crumbs. Wally is brilliant but lazy, so he at least enjoys a fool’s paradise of endless coffee and donuts while his co-workers clean up his messes. The P.H.B. is neither smart nor industrious, so he is forever on top, reaping the rewards of everyone else’s toil. Dogbert, an inveterate scammer with a passing resemblance to various trickster deities, makes out best of all.” Compare with the famous observation that executives are sociopaths, management are clueless, and the workers losers. Yeah, it’s interesting to compare Rao and Adams. Rao formulated his Gervais Principle as a specific response to Adams’ Dilbert Principle, which I guess means Rao thought Adams got it wrong. Did he? The Pointy Haired Boss seems to go back and forth between Clueless and Sociopath, which is probably why Rao thought Adams’ work fell short. Dogbert is clearly Sociopath, but has no permanent role in the corporation, and doesn’t really represent a real thing you can be - his character was a ridiculous scammer who succeeded at near-impossible endeavours (like convincing people he was a Nostradamus-style mystical prophet) because the logic of the strip demanded it. Later, Adams foregrounded the CEO character more, maybe to create a purer Sociopath, letting the Boss go closer to Clueless. This is making me somewhat regret accusing Adams of wanting to be the Pointy-Haired Boss. It would have been fairer (and less of an accusation/surprise) to accuse him of wanting to be Dogbert. But again, Dogbert doesn’t represent a real thing you could be, which might have been why the PHB made a better metaphor. (contra my claim, the cover of Win Bigly shows a mashup of Dogbert and Trump. Fine, Dogbert is a thing one person can be.) You can read my full review of The Gervais Principle here. cincilator writes: Scott Alexander, former tribune of nerds now says that the sneerclub was right about everything all along? I didn’t expect that, let me tell you. Several people interpreted me as attacking nerds. I disagree - I think I was attacking self-hating nerds, because nerdiness is fine and you shouldn’t have to hate yourself for it. To spell it out more explicitly: All nerds must eventually realize they’re not going to immediately dominate everything by intellect alone. This isn’t because intellect isn’t great, it’s because 1) it’s only one of many skills, and 2) you probably aren’t even the person with the most intellect. Again, every mildly-talented person has to face this realization, whether it’s a nerd realizing he won’t be the next Einstein or a jock realizing he won’t be the next LeBron. If someone deals with this using denial (one of Freud’s maladaptive defenses), you get the nerd who says no, I really am the next Einstein, ie a crackpot, aka the sort of person who gets featured on Sneerclub. If they deal with it using reaction formation (another of Freud’s maladaptive defenses), you get the self-hating nerd, aka the sort of person who joins Sneerclub4. If they just deal with it maturely instead of spinning up maladaptive defenses against it, they’re a nerd who is hopefully good-natured and accepting of their nerdiness, and hopefully does some good work in some specific small area, and changes the world in some specific small way (or some very large way, if they can work together with other people and get lucky). Bugmaster writes: I think Adams is basically correct. Yes, facts and evidence do exist and are real; but they have virtually no impact on anything socially important -- i.e., on anything important whatsoever. Memes and charisma and persuasion are what matters if you want to achieve life goals that extend beyound yourself and your immediate family. I worry that Adams (and you) are doing something where unless the average person can solve every problem by facts and intelligence alone, then facts+intelligence lose and memes and persuasion win. But the average person also can’t solve every problem by memes+persuasion alone! If Dilbert is an 80th percentile nerd, the 80th percentile persuader is - I don’t know, a used-car salesman? Dilbert’s probably earning more money, especially nowadays when he could make L5 at Google. And if Donald Trump is a 99.9999th percentile persuader, the 99.9999th percentile nerd is Ilya Sutskever. Probably most people would slightly prefer being Trump to Sutskever, but Sutksever does have a couple billion dollars, plus the more ethereal rewards of genius; it still seems like a pretty good deal. I also think you’re doing a sort of black-and-white thinking here. Every day, great persuaders like Sam Bankman-Fried and Elizabeth Holmes end up in jail, because in fact the things that they said were true were not true. Every day, smooth-talking charismatic manipulators successfully seduce the girl into bed with them, then totally fail to turn it into a happy stable marriage, because after a few years even the dumbest woman catches on and figures out whether her mate provides real value or not. Even Donald Trump has only a 37% approval rating, because he can’t make “we should alienate our allies over Greenland” sound plausible to most of the American people. When someone’s very good at it, persuasion sometimes helps them blur facts around the edges. But that’s it. Nobody except Scott Adams and a few psychotherapists ever go to hypnotist school. Most don’t even go to any formal persuasion classes. That’s because hypnotism/persuasion isn’t really a lifehack that helps you win all the time at everything. If the world’s best hypnotist asked a room of VCs for money with a stupid business plan, he would probably fail. This isn’t to say persuasion is useless, and in certain fields it can be very powerful indeed. But let’s not go crazy and start worshipping it. The grass is always greener on the other side. The nerd sits in his cubicle and thinks “If only I were more charismatic.” But the salesman with the bright teeth and the firm handshake thinks “Man, I bet I could get out of this dead-end job if only I were smarter.”5 … 4: The Part On Race And Cancellation (INCLUDED UNDER PROTEST) … Ilya Lozovsky writes: Ninety percent of this essay is brilliant — smarter and realer than anything anyone else has written about Adams — but the end lost me. It's too generous, to the point of being a whitewash. Adams was vicious and hateful and played a material role in convincing Americans to vote for actual fascism. I don't think it's right to "hand it to him." JJ McCullough (JJM’s Shortstack) writes: Good essay, but I think you kinda yadda-yadda'd away his racist rant, which was extremely explicit and extended. I think it was the opposite of a "bog-standard cancellation," which we think of as being a slightly unfair, overzealous policing of an at least slightly subjectively offensive comment, often from years ago. But Scott went on quite a long diatribe about why black people, as a group, are dangerous and undesirable to be around, and why he, personally, goes out of his way to avoid them. Some conservatives have tried to use "bog-standard" anti-woke logic in defending him, but no, his comments really are quite explicitly and undeniably racist, if that term has any useful definition at all. Alex Wotbot writes: Now, you quoted Adams saying: “the best advice I would give to white people is to get the hell away from black people; just get the fuck away” If this was the intended point, does it really make sense that only the far-left freaked out? It’s kind of important to mention this was within a hypothetical. Suppose a survey reported that 26% of a population believes “The phrase ‘It’s OK to be blonde’ is hate speech” and another 21% weren’t sure if they agree with the statement or not. Now suppose you were blonde, would you hang around that population? Now go read the February 2022 Rasmussen Reports survey. Please do better than this, I don’t want to have to Gell-Mann memoryhole this. Many people had strong opinions on this, so I have to respond to it. But first, I want to make it extra clear in capital letters: I AM DOING THIS IN THE COMMENTS POST, TO RESPOND TO YOUR COMMENTS, AND NOT BECAUSE I THINK IT IS THE MOST IMPORTANT THING. Certain people screenshotted the one paragraph of my ten thousand word essay that discussed this and posted it on Twitter, in order to make it look like I was joining in some kind of chorus of liberals reducing Adams to his worst moment. I posted what I thought was a no-nonsense, factual description of what happened, in order not to be accused of hiding it or covering it up. It was the least important part of my essay, I’m aware that writing about it at all opens me to attack from both sides, and I discuss it here only to respond to all of you who wanted to know my opinion on it. Just don’t screenshot it on Twitter and say “LOOK SCOTT IS STILL HARPING ON THE RACE THING”, that’s all I’m asking. That having been said… To make sure we’re all on the same page - Adams’ comments were prompted by this poll, conducted February 2023. The question was: “Do you agree or disagree with this statement: ‘It’s OK to be white’” Among blacks, 53% agreed, 26% disagreed, and 21% were “not sure”. Among whites, the numbers were 81/7/13. Here’s the video of Adams’ comments: Transcript: If nearly half of all blacks are not okay with white people - according to this poll, not according to me - that’s a hate group. And I don’t want to have anything to do with them. And I would say, based on the current way things are going, the best advice I would give to white people is to get the hell away from black people. Just get the f**k away. Wherever you have to go. Just get away. Cause there’s no fixing this. This can’t be fixed. You just have to escape. That’s what I did. I went to a neighborhood with a very low black population. Because unfortunately, there’s a high correlation between the density - this is according to Don Lemon, here I’m just quoting Don Lemon, who said when he lived in a mostly black neighborhood, there were a bunch of problems he didn’t see in white neighborhoods. So even Don Lemon sees a big difference, for your quality of living, based on where you live and who’s there. So I think it makes no sense whatsoever as a white citizen of America to try to help black citizens anymore. It doesn’t make sense. Because there’s no longer a rational impulse. And so I’m… I’m gonna, uh, I’m gonna back off from being helpful to black America, because it doesn’t seem like it pays off. Like I’ve been doing it all my life, and I’ve been… the only outcome is I get called a racist. That’s the only outcome. [cackles] It makes no sense to help black Americans if you’re white… it’s over. Don’t even think it’s worth trying. Totally not trying. Is this racist? I have a piece called Against Murderism, where I talk about why it’s so hard for people to agree on questions about “racism”. The summary: although it would be possible to have someone be purely, axiomatically racist - having it be a premise of their reasoning that they hate black people - in practice few people are like this. More typically, people have some argument more like: I don’t like [specific bad thing]