{"id":1730,"date":"2025-11-13T08:33:00","date_gmt":"2025-11-13T04:33:00","guid":{"rendered":"https:\/\/www.shortform.com\/blog\/hub\/?p=1730"},"modified":"2025-11-18T00:33:43","modified_gmt":"2025-11-17T20:33:43","slug":"game-theory-explained","status":"publish","type":"post","link":"https:\/\/www.shortform.com\/blog\/hub\/science\/psychology\/game-theory-explained\/","title":{"rendered":"Game Theory, Explained: How People Make Certain Choices"},"content":{"rendered":"\n<p>What makes people play the way they do? Game theory offers a mathematical way to answer that question, modeling how individuals make strategic choices when others\u2019 actions affect the outcome. From poker tables to global markets, this theory reveals why some decisions lead to cooperation, competition, or chaos.<\/p>\n\n\n\n<p>In this article, we explain game theory through ideas from <em>On the Edge<\/em> by Nate Silver, <em>Algorithms to Live By<\/em> by Brian Christian and Tom Griffiths, <em>Sapiens<\/em> by Yuval Noah Harari, and <em>The Undercover Economist<\/em> by Tim Harford. Together, these works show how the logic of strategy underlies everything from evolution to economics\u2014and how mastering it can help you think more clearly about the games we all play.<\/p>\n\n\n\n<div class=\"wp-block-yoast-seo-table-of-contents yoast-table-of-contents\"><h2>Table of Contents<\/h2><ul><li><a href=\"#h-what-is-game-theory\" data-level=\"2\">What Is Game Theory?<\/a><ul><li><a href=\"#h-mutually-harmful-equilibria-the-problem-game-theory-can-solve\" data-level=\"3\">Mutually Harmful Equilibria: The Problem Game Theory Can Solve<\/a><\/li><\/ul><\/li><li><a href=\"#h-economics-and-game-theory\" data-level=\"2\">Economics and Game Theory<\/a><ul><li><a href=\"#h-poker\" data-level=\"3\">Poker<\/a><\/li><li><a href=\"#h-selling-air\" data-level=\"3\">Selling Air<\/a><\/li><li><a href=\"#h-united-states\" data-level=\"3\">United States<\/a><\/li><li><a href=\"#h-united-kingdom\" data-level=\"3\">United Kingdom<\/a><\/li><\/ul><\/li><li><a href=\"#h-the-issue-with-game-theory\" data-level=\"2\">The Issue With Game Theory<\/a><\/li><li><a href=\"#h-dive-deeper-into-game-theory\" data-level=\"2\">Dive Deeper Into Game Theory<\/a><\/li><\/ul><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-game-theory\"><strong>What Is Game Theory?<\/strong><\/h2>\n\n\n\n<p><strong>Game theory is the mathematical study of the strategic behavior of two or more agents (players) in situations where their actions impact one another<\/strong>. According to Nate Silver\u2019s explanation of game theory in <em><a href=\"https:\/\/www.shortform.com\/app\/book\/on-the-edge-nate-silver\/preview\" rel=\"nofollow\">On the Edge<\/a><\/em>, it seeks to predict the outcome of interactions and model the optimal strategies for each player to maximize their expected value while considering the actions of other players. <em>Nash equilibrium<\/em>, named after mathematician John Nash, is a fundamental concept in game theory<strong> <\/strong>that describes a situation in which each player in a game has chosen a strategy that\u2019s optimal given the strategies chosen by all other players.\u00a0<\/p>\n\n\n\n<p>In other words, in a Nash equilibrium, no player has an incentive to unilaterally change their strategy because doing so wouldn\u2019t benefit them given the strategies that the other players have chosen. Understanding the Nash equilibrium helps us predict how rational decision-makers should behave when faced with situations where their choices impact and are impacted by the choices of others. By identifying the Nash equilibrium, <strong>game theory enables us to model and analyze strategic behavior, predict outcomes, and determine the most advantageous strategies <\/strong>for each player in a given situation.<\/p>\n\n\n\n<p>Silver explains that researchers use game theory in economics, the social sciences, and computer science to predict how people will behave. Game theory is also crucial for gamblers: Being a good poker player involves predicting what your companions are going to do\u2014while remaining unpredictable yourself. Randomization and deception enable players to gain an advantage by keeping their opponents guessing and preventing them from easily predicting their strategy.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>The Biology of Game Theory<\/strong><br><br>Silver\u2019s presentation of game theory as a tool for understanding strategic behavior finds confirmation\u2014and elaboration\u2014in bacterial research. Scientists have discovered that some bacterial interactions follow game theory\u2019s predictions with remarkable precision: Certain strains of <em>E. coli<\/em> compete in a perfect <a href=\"https:\/\/www.science.org\/content\/article\/game-three-microbes\" target=\"_blank\" rel=\"noreferrer noopener\">rock-paper-scissors<\/a> pattern, where one strain produces a toxin, another is resistant to it but grows slowly, and a third grows quickly but is vulnerable to the toxin. Each can outcompete one of its rivals but is vulnerable to the other, creating a perpetual cycle that game theory predicts.&nbsp;<br><br>Research on \u201cselfish\u201d bacteria (which continue growing when resources are scarce) and \u201ccooperative\u201d bacteria (which slow their growth to preserve resources) has revealed how game theory can help us understand <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC4071512\/\" target=\"_blank\" rel=\"noreferrer noopener\">more complex competitive dynamics<\/a>. While Nash equilibrium calculations suggest selfish bacteria should dominate, experiments show that cooperative bacteria often survive by organizing themselves spatially\u2014suggesting that game theory can be expanded to account for how physical and social structures affect competition. Game theory\u2019s insights extend beyond human behavior to illuminate patterns throughout nature, while also revealing new dimensions of balancing competition and cooperation.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>These mathematical concepts\u2014probability, expected value, Bayesian reasoning, and game theory\u2014form a shared language that enables people to analyze risk and make decisions under uncertainty. For some people, this quantitative approach becomes more than just a toolkit: It becomes a way of seeing the world.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mutually-harmful-equilibria-the-problem-game-theory-can-solve\"><strong>Mutually Harmful Equilibria: The Problem Game Theory Can Solve<\/strong><\/h3>\n\n\n\n<p>Brian Christian and Tom Griffiths\u2019 book, <em><a href=\"https:\/\/www.shortform.com\/app\/book\/algorithms-to-live-by\/preview\" rel=\"nofollow\">Algorithms to Live By<\/a><\/em>, details one major type of problem that game theory is good at solving: mutually harmful equilibria. When the optimal strategy for each player causes more harm to others than it helps the one using it, the system incurs a collective loss. In this case, the current Nash equilibrium <em>hurts all players involved<\/em>.\u00a0<\/p>\n\n\n\n<p>For example, bluefin tuna fishing has a mutually harmful equilibrium. This tuna makes valuable sashimi, so each fisher\u2019s optimal strategy is to catch and sell as many tuna as possible. However, after years of overfishing, the tuna is in danger of going extinct\u2014if it isn\u2019t protected, it\u2019ll disappear, harming all the fishers who used to profit from it.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Mutually Harmful Cultures<\/strong><br><br>In <em><a href=\"https:\/\/www.shortform.com\/app\/book\/sapiens\/preview\" rel=\"nofollow\">Sapiens<\/a>, <\/em>Yuval Noah Harari<a href=\"https:\/\/www.shortform.com\/app\/book\/sapiens\/chapter-13\" target=\"_blank\" rel=\"noreferrer noopener\"> frames human culture as a series of games with often arbitrary rules<\/a>\u2014and sometimes, mutually harmful equilibria. The goals that humans are culturally compelled to achieve may end up doing collective harm to the human race. For example, two countries who believe they need military superiority over the other engage in an arms race, spending vast amounts of their nations\u2019 wealth on progressively more powerful weapons. In the end, the balance of power remains the same as when it began, but the countries have wasted money that could have been used to improve their citizens\u2019 quality of life.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-economics-and-game-theory\"><strong>Economics and Game Theory<\/strong><\/h2>\n\n\n\n<p>In his book <em><a href=\"https:\/\/www.shortform.com\/app\/book\/the-undercover-economist\/preview\" rel=\"nofollow\">Undercover Economist<\/a><\/em>, Tim Harford uses game theory to explain economic behavior. A \u201cgame\u201d is an activity in which predicting another\u2019s actions affects your own actions. Many everyday situations, like driving, are games. When you\u2019re behind the wheel, you drive based on the rules of the road but also based on what behavior other cars on the road are exhibiting. If a car is driving erratically, or too quickly, you\u2019ll likely switch into a more defensive driving mode. If a car in front of you is driving too slowly, you\u2019ll attempt to pass.\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-poker\"><strong>Poker<\/strong><\/h3>\n\n\n\n<p>John von Neumann and many of his game theory contemporaries were fascinated with poker as an application for their game theory. In poker games, you win an entire pot of money if you finish with the best hand. There are rounds of betting in which players make decisions based on how other players are behaving about whether to stay in a hand, in an attempt to win, or whether to get out of the hand and save their money. Players can calculate in real time whether it\u2019s worth paying to stay in.&nbsp;<\/p>\n\n\n\n<p>For example, in the poker game Texas Hold \u2018Em, communal cards that everyone can see and use are shown by the dealer after every round of betting. Players are often looking for a specific card or kind of card to complete a hand. It doesn\u2019t take too much math to figure out the probability of a card coming up and whether it&#8217;s worth it to pay to stay in the hand and look for your card.&nbsp;<\/p>\n\n\n\n<p>Where it gets more complicated, and where game theory comes into play, is what the other players are doing. Players both figure out the probability of their best hand <em>and <\/em>predict whether their potential hands will beat their opponents\u2019 potential hands. There are clues about what cards an opponent might have based on how they are betting, but they could be \u201cbluffing,\u201d or intentionally attempting to mislead other players into making a bad decision. Players also understand that the other players are analyzing <em>their <\/em>moves. This is why poker remains so popular and endlessly fascinating. It\u2019s a game of secrets that\u2019s governed by complex game theory and larger understandings of human behavior.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-selling-air\"><strong>Selling Air<\/strong><\/h3>\n\n\n\n<p>Governments and private companies also often use game theory to make big decisions. For example, multiple national governments have sold the rights to their air to telecom companies, with widely varying results based on how successful their game theory strategies were.&nbsp;<\/p>\n\n\n\n<p>In selling the rights to air to telecom companies, the companies and the government are engaged in a complex game. Individual telecom companies\u2019 goal is to buy the rights to use valuable airspace for as little money as possible. The government is attempting to sell radio-spectrum licenses (which govern the rights to use their air) to telecom companies that they think will provide a good service to their citizens, while also getting a good value on the air.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-united-states\"><strong>United States<\/strong><\/h3>\n\n\n\n<p>The United States had a disastrous rollout of leasing air. They devised a system in which competing firms would submit public bids for licenses that governed various parcels of air. The system was intended to encourage open and honest competition between firms that would drive up the price on all of the licenses the government was offering.&nbsp;<\/p>\n\n\n\n<p>The private firms, though, found a loophole in the system. They realized that there were enough licenses available for purchase that every firm could be satisfied with a portion, and developed a system to <em>communicate <\/em>with one another through their public bids. If a firm wanted control of the airspace over one particular zip code in the United States, they would submit a bid of the \u201cprice\u201d of the zip code. If a firm wanted control of the airspace over 90039, for example, they would submit a bid of $900.39. This public bid signaled to all of the other companies to back off of 90039. By working together publicly, all of the companies ended up with licenses for parcels of air they were satisfied with. And they paid only a fraction of these licenses\u2019 market value.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-united-kingdom\"><strong>United Kingdom<\/strong><\/h3>\n\n\n\n<p>The United Kingdom learned from the failures of the United States. They hired a team of game theory experts to run their sale of telecom licenses. After the U.S. failed with the auction system, many experts were unsure if an auction would work. One of the members of the game theory team, though, used a simple problem to explain why it would. He took two of his peers\u2019 wallets. Then, he asked them, without communicating directly with one another, to bid on the money in the wallets combined. They couldn\u2019t figure out a good strategy. Game theory, if applied in auctions, works in the same way. You know how much money is in your own wallet, and thus how much it&#8217;s worth to you, but have no idea how much money is in the other wallet. It\u2019s like poker: You know how much you value something, but don\u2019t know how much other people value it. And others\u2019 behavior can change the way you think about the value of something in real time.&nbsp;<\/p>\n\n\n\n<p>England had five telecom licenses to sell. They devised an online auction where everyone in the online room agrees to pay the highest bid for each license. Essentially, each buyer has to decide how much each license is worth. The buyers who believe a license is worth a lot of money are also the buyers who are confident in their ability to innovate and deliver a service that people like. This solves the problem of both making a lot of money and delivering a public good. The buyers without confidence in their technology will leave once the price becomes too high. As buyers leave, other companies revise what they think a license is worth, because the act of a company leaving gives them more information. This makes it impossible to bluff much because if buyers leave quickly, a company will be stuck paying a price it doesn\u2019t want to.&nbsp;<\/p>\n\n\n\n<p>This type of auction only works if there are many good buyers. The team set about finding these buyers next. There were already four big telecom companies in England, and many others interested in getting into the game. This worked out to 13 companies in total, all of which agreed to pay a 50 million pound deposit to bid for the five licenses for 3G service.&nbsp;<\/p>\n\n\n\n<p>The team set aside one license, \u201cLicense A,\u201d for one of the nine new companies. All 13 could bid for the other four. Competition for License A drove competition for the other four licenses. As the price of License A climbed above the other four, those became a good deal. Each company had to submit a high bid for a license each round and had three \u201cpasses,\u201d where they didn\u2019t have to bid at all.&nbsp;<\/p>\n\n\n\n<p>The English government estimated that they would raise 3 billion pounds from the auction. They reached that after 50 rounds, but all 13 companies were still in, and the bidding kept climbing, with no signs of slowing down. After a few months, the government had raised 10 billion, and one of the bidders dropped out. Five bidders then dropped out in quick succession\u2014they learned from each other\u2019s estimates what the 3G was worth. Other companies staying in longer than expected had forced the companies to reevaluate in real time. Eventually, the auction raised a total of 22.5 billion pounds for the five licenses. Ultimately, <strong>the strategy along with the scarcity of the licenses<\/strong><strong><em> <\/em><\/strong><strong>raised the price. <\/strong>Some telecom companies desperately wanted a 3G license, and there were only five on offer. The auction forced them to pay a lot of money for a scarce product.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-issue-with-game-theory\"><strong>The Issue With Game Theory<\/strong><\/h2>\n\n\n\n<p>While game theory is successful in certain cases, Harford says one problem is that it relies on rational actors. In the case of the bidding in England, the companies all acted rationally, because they had big teams and data models that led them to the conclusion that the licenses were worth a lot of money. In a friendly poker game, it\u2019s harder to use knowledge of game theory to your advantage, because your opponents often don\u2019t act in their own self-interest. The creators of game theory were accomplished mathematicians who could do complex calculations in their heads. Don\u2019t assume this to be the case with everyone involved in any game you are playing.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-dive-deeper-into-game-theory\"><strong>Dive Deeper Into Game Theory<\/strong><\/h2>\n\n\n\n<p>To learn more about game theory, check out Shortform\u2019s guides to the books mentioned in this article:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.shortform.com\/app\/book\/on-the-edge-nate-silver\/preview\" rel=\"nofollow\"><em>On the Edge<\/em><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.shortform.com\/app\/book\/sapiens\/preview\" rel=\"nofollow\"><em>Sapiens<\/em><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.shortform.com\/app\/book\/algorithms-to-live-by\/preview\" rel=\"nofollow\"><em>Algorithms to Live By<\/em><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.shortform.com\/app\/book\/the-undercover-economist\/preview\" rel=\"nofollow\"><em>Undercover Economist<\/em><\/a><\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Game theory is the study of how people or groups make strategic decisions when their choices affect one another. Here&#8217;s an overview with examples.<\/p>\n","protected":false},"author":14,"featured_media":1784,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[27,5],"tags":[],"class_list":["post-1730","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-psychology","category-society-culture"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.3 (Yoast SEO v24.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Game Theory, Explained: How People Make Certain Choices - Shortform Hub<\/title>\n<meta name=\"description\" content=\"Game theory is the study of how people or groups make strategic decisions when their choices affect one another. 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Her preferred genre of books has changed drastically over the years, from fantasy\/dystopian young-adult to moving novels and non-fiction books on the human experience. Katie especially enjoys reading and writing about all things television, good and bad.\",\"knowsAbout\":[\"Bachelor of Arts in English With a Concentration in Creative Writing\"],\"jobTitle\":\"Senior SEO Writer\",\"worksFor\":\"Shortform\",\"url\":\"https:\/\/www.shortform.com\/blog\/hub\/author\/katie\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Game Theory, Explained: How People Make Certain Choices - Shortform Hub","description":"Game theory is the study of how people or groups make strategic decisions when their choices affect one another. 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