The Dating Game That Eats Civilization

The lecture begins by clearing the board. Source trail 0:001:362:433:58 This semester, we are going to analyze a question together, which is, how do societies behave? Why do we do what we do? What motivates us? What drives us? And there have been different theories as to what drives human b...If we cannot have children, we all die. So the point of our existence is to have children and have them pass on their genes to others, okay? And for males and females, life is different. Because as a man, you have a pen... Religion says behavior is a war between good and evil. Biology says it is sex and reproduction. Race and culture say it is group dominance. Economics says it is money or self-interest. Liberalism says history moves toward enlightenment, truth, justice, and heaven. Game theory enters as another theory, but Jiang presents it as the working tool for the semester: not a moral story, not a utopian story, but a way to analyze behavior.

A game has three parts: players, rules, and incentives Lens point game-theory-method Jiang's game-theory method begins by finding the real game: the players, constraints, incentives, and actual reward that make an actor's behavior rational from inside the game, even when it looks irrational from outside. Source trail 5:22 So that's my argument to you this semester. So the entire semester, we will study game theory. All right, so what is game theory? All right. Game theory is very simple. The idea is that there are three components to a g... . Players are the participants. Rules are the constraints, the boundary conditions, the limits of possible action. Incentives are how you win. Once those three are visible, the game can be understood, and if it can be understood, it can be predicted.

This is also Jiang's account of education. Source trail 6:437:499:03 And what I want to show you, or what I promise you, is that if you learn game theory, there'll be three major benefits to you as a student. Again, you don't have to learn game theory. You don't even have to come to clas...So one benefit of learning game theory is you become smarter, and therefore you become a better person, okay? That's number one. Number two is you'll be able to understand the world that we live in because this world is... The point is not grades, admission, or a job. The point is to become someone who can look at the world and ask why the stupid thing happened, what game produced it, and where it is likely to go next. Current events matter because they train prediction.

The demonstration is a deliberately crude dating game: five boys, five girls, ranked by genes, wealth, and status. Source trail 11:1412:2913:5215:16 Let's imagine there are five boys and five girls. And they want to get married, okay? So these are the players. And what we're going to do is we're going to divide them up into male and female. Then what we're going to...You have a high status job. You come from a really powerful family, okay? So these are the three criteria that we can use to judge a person's attractiveness. And then what we can do is rank them from five to one. Five m... Biology says the top male should try to reproduce with everyone. Economics says he should maximize his outcome. But if he grabs for everyone, the other players respond, and he can end up with the worst result. Individual maximization creates collective damage.

The cooperative solution is clean: five marries five, four marries four, three marries three, and the world makes sense. Source trail 16:1617:28 So the only way out of this is if they cooperate, okay? And the best way to cooperate is basically five is like, you know what? Screw this. I'm not going to go after four or three. I'll just have my five, okay? Four is...There's a problem with this though. The problem is, in real life, no one does this. Okay? In real life, no one actually follows this rule. Nash equilibrium is just a theory we made up. But in real life, this is not what... Jiang calls this Nash equilibrium, the point where the players maximize their outcomes. Then he immediately breaks it. Real life does not follow this rule. The perfect model exists, and then people choose the suicidal version anyway.

The classroom exercise makes the failure visible. Source trail 17:2818:46 There's a problem with this though. The problem is, in real life, no one does this. Okay? In real life, no one actually follows this rule. Nash equilibrium is just a theory we made up. But in real life, this is not what...What's the minimum? Okay? And then I had the boys and the girls write down a response. The boys were pretty simple, right? Well, you know, as long as she likes me and as long as I can put my penis into her, I'm good. Ok... Men, in Jiang's telling, report very low minimum requirements. Women, when love and attraction are absent, demand enormous compensation. The point is not a neutral sociology of dating. The point is that the actual incentive has not yet been named.

Modern dating, in this lecture, is not a procreation game. Source trail 20:0121:11 Look at these billionaires, right? Like Elon Musk. How many wives does he have? How many children does he have? Right? All the women in the world, many, not all, but many, just want to marry actors like Brad Pitt. Billi...We know what the players are. The players are doing stupid things. The rules, we know, okay? But incentives is something that we have to think about. Why are they behaving like this? And the answer is because they're no... It is a status game. A partner is not only a lover or co-parent. A partner is a public signal: the Instagram picture, the mall walk, the person you can brag about. Once that is the payoff, the lower-ranked players withdrawing into screens and resentment is not random failure. It is the losing side of a status tournament.

That is Jiang's crucial reversal: people are rational, but only if you identify the game correctly Lens point game-theory-method Jiang's game-theory method begins by finding the real game: the players, constraints, incentives, and actual reward that make an actor's behavior rational from inside the game, even when it looks irrational from outside. Source trail 21:1122:13 We know what the players are. The players are doing stupid things. The rules, we know, okay? But incentives is something that we have to think about. Why are they behaving like this? And the answer is because they're no...Number one, she may be the ugliest woman in the world, but she's still like, you know what? It's still my choice whether or not to have kids. And having kids is a pain in the ass. So if I'm going to make this sacrifice,... . A woman who refuses children unless the partner is sufficiently attractive, rich, or high-status is not maximizing the species. She is maximizing inside the status game. The civilization may die, but the individual's move still makes sense.

The game changes because the superstructure changes. Source trail 23:1424:4025:5627:02 We've been around for like a long time. So how is it that humans have survived for so long doing these stupid things? And the answer is because the game changes over time according to the superstructure of society. Okay...They don't understand what germs are. So it's very easy for a woman to die in childbirth. Okay? And low competition. Low competition just means that there are no competing villages against them. Okay? So that's one kind... Superstructure means the big picture: population, wealth, technology, enemies, demographics, economics, culture, politics, and religion. A small poor village, a growing competitive society, and an overpopulated wealthy society do not play the same mating game. The rules of intimacy are downstream from the structure of survival.

In the overpopulated wealthy world, dating appears because marrying up is one of the few ways to change status. That is why fertility falls Lens point atlas-relation Fertility becomes a status game when dating, marriage, children, and national survival are organized by rank incentives: a wealthy society can rationally select away its future if children lower status, while another society can make children honorable by tying them to love, duty, religion, patriotism, and survival. Source trail 28:02 And the only way that you can change your status is by marrying up. And that's why you have a dating game. A dating game is an opportunity for you to find someone better than your social demographic circumstance can sug... . The dating game gives people choice, and choice is used to seek a higher rank. If the better match never appears, the children do not appear either.

Governments try money because money is legible to policy. Jiang says this misses the incentive. People do not want money; they want status. Money can be printed, transferred, subsidized, and promised. Status is zero-sum. If the game is status, cash cannot solve the fertility crisis because it does not change the rank structure Lens point atlas-relation Fertility becomes a status game when dating, marriage, children, and national survival are organized by rank incentives: a wealthy society can rationally select away its future if children lower status, while another society can make children honorable by tying them to love, duty, religion, patriotism, and survival. Source trail 29:32 Now it's one. Okay? So the trend is very very negative. Okay? So governments all around the world are trying to figure out what to do. How do you convince women to have more kids? And what we've discovered is it's impos... that made children unattractive.

The best warning sign is not poverty. Source trail 30:4632:09 indicator that a society is about to collapse is if the woman who are wealthy and well educated if they refuse to have children. This is the same this is what happened to the Romans who collapsed. This is what happened...Okay? And then once I have these two I can now figure out where it came from and where it's going. Okay? That's what I want to teach you in this class. How to analyze a situation so you understand the players the rules... It is wealthy, educated women refusing children. Jiang reads that as the signal that a civilization has reached its late stage. Birth, maturation, collapse: the dating game is not a side topic but a way to infer where a society came from and where it is going.

The map then turns the model global. Source trail 33:2834:3035:38 Okay? As you can see okay oh sorry so the color scheme is this. The red is where the population the society has an above replacement fertility rate. Okay? So above 2.1. If it's dark red like here in the middle of Africa...Alright? And here the situation is very very dire. North America and Europe are kind of okay. Why? Because of immigration. Because even though their women are not having children they can choose to import people for the... Africa still has high fertility because survival and competition force families toward many children. North America and Europe can cover some of their fertility deficit with immigration. East Asia, especially South Korea, is described as much more exposed. Wealth, aging, low fertility, and status competition combine into collapse pressure.

The harsh forecast is simple: if you want to know who rules in one hundred years, ask where wealthy, well-educated women still choose children. Source trail 35:3836:4838:0648:29 Okay? But you look at wealthy areas well they're probably gone in 100 years time. Okay? It's total total collapse. The solution that governments are choosing right now is to import immigrants. Okay? Especially so these...Okay? So this is per capita GDP. Okay? So how much people make. Alright? So obviously if you're zero you're very poor and if you move to over here you're very wealthy. Okay? So the United States is the wealthiest societ... Jiang's answer in this lecture is Israel. On the 2024 data he cites, it is the wealthy high-tech society with above-replacement fertility and therefore the society with the disturbing advantage.

Israel is the reversal because fertility itself becomes status Lens point atlas-relation Fertility becomes a status game when dating, marriage, children, and national survival are organized by rank incentives: a wealthy society can rationally select away its future if children lower status, while another society can make children honorable by tying them to love, duty, religion, patriotism, and survival. Source trail 39:16 Because they think they are different from everyone else and and they must unite together to survive. So in Israel fertility is status. Okay? If you are a woman and you give birth to a lot of kids that means that you lo... . To have children is to love Israel, to join the war for survival, to be a patriot. The same status mechanism that sterilizes one society can make another society fertile if honor attaches to children rather than followers, money, or views.

The West, in Jiang's contrast, has surrendered religion, family, and patriotic duty to materialism. Source trail 39:1640:32 Because they think they are different from everyone else and and they must unite together to survive. So in Israel fertility is status. Okay? If you are a woman and you give birth to a lot of kids that means that you lo...That's all that matters. So given the current state of state of events it's very hard for the western world and really for China to survive for the next 50 years. Okay? I and I know like well China has a billion people... The prestige markers are followers, views, subscribers, and money. China and the West may still have population and wealth, but if status rewards childlessness or extreme selectivity, the future population is already being selected away.

South Korea is the nightmare image. Source trail 40:3241:3642:40 That's all that matters. So given the current state of state of events it's very hard for the western world and really for China to survive for the next 50 years. Okay? I and I know like well China has a billion people...Okay? That is a zombie society where no one works and everyone just I don't know walks around the park every day. No one works. So the economy has collapsed. Okay? So look look at this trend where we are now in here oka... Jiang calls it a future zombie society: old people, no children, no workers, and an economy that cannot reproduce itself. The dates matter because they make the claim falsifiable and historical: pressure by 2040, severe danger by 2080, a best-case dead society by 2150 if nothing changes.

The Samsung example compresses the trap. Source trail 42:4043:58 So if things are stay the same if nothing happens South Korea will be will be dead in I don't know by 2150 okay? Best case scenario. But what we know from history is that society should not die naturally. Eventually Sou...Okay? And if you're a middle class person in South Korea it makes no sense for you to have three kids. It makes sense for you to have one kid and put all your resources into this one kid in the hopes that he passes the... A middle-class South Korean family does not have three children because the rational status move is to pour everything into one child, one exam path, one good university, one job. The family is optimizing. The society is not.

A student notices the obvious counterexample: Saudi Arabia also appears wealthy and fertile. Source trail 44:4345:12 So for the last graph that we talked about Israel and I've noticed that the Saudi Arabia that is also like at have not bad GDP per capita and fertility rates so but for Saudi Arabia maybe I'm wrong like stereotypically...Okay. That's actually a really good question. Okay. All right. So Saudi Arabia as you can see from this map has it's a very wealthy society and families have about four kids on average. All right. So Saudi Arabia is act... Jiang's answer is that Saudi Arabia is an outlier created by oil money, welfare-state incentives, and religious duty. It can support children because the state pays, and Islam gives fertility moral force. But this is not the same structure as Israel.

The missing variable is human capital and openness. Source trail 45:1246:2047:30 Okay. That's actually a really good question. Okay. All right. So Saudi Arabia as you can see from this map has it's a very wealthy society and families have about four kids on average. All right. So Saudi Arabia is act...Okay. Saudi Arabia just gets all its money from oil and that's it. It's trying to grow terrorism it's trying to develop its human capital but it doesn't really work. Okay. So you're right in that Saudi Arabia it is it s... Saudi Arabia can look strong on a fertility graph, but Jiang argues that a strong nation needs education, criticism, social mobility, innovation, and technology. Oil can buy time. It cannot by itself create a dynamic society.

Then Jiang qualifies the entire apparatus: game theory does not give the answers. Source trail 47:30 Okay. It's also really highly educated. Alright. So does that make sense? Okay. So Saudi Arabia it's really an outlier here. Alright. But the problem is what happens if Saudi Arabia runs out of oil right? Or there's a w... It gives a guide for asking questions and doing research. That sentence is the safeguard against turning the lecture into prophecy. The method generates a map of incentives, then the map has to be tested.

A second student asks about the data date. Source trail 48:1048:29 I was wondering about like when is this data it's it's wrote about 2009 right? So how about now? Did it change a lot? Or like is there anything changed?Okay. Okay. Yeah. So you asked you asked about the sourcing of the data. Okay. And you're right in that there will be fluctuation. Okay. But the but this is 2024. Okay. 2024 and this is Israel right here. Okay. Alright.... Jiang says the displayed data is 2024 and repeats the core claim: Israel is the only wealthy nation in the world with above-replacement fertility. The closing matters because chronology matters. This is not an undated mood about decline; it is a 2026 lecture making claims from a 2024 data frame.