AI Wealth Truth (07): Why the Poor's 'Irrational' Decisions Can Be the Optimal Choice

I. The poor are often criticized for making "irrational" decisions. Why not save money? Why buy lottery tickets? Why borrow even when you know high-interest loans are a trap? Why would you rather buy a 200-yuan knockoff pair of sneakers than save to buy a 500-yuan branded pair that lasts three years? The middle class shakes its head: poor people have no long-term vision.

II. But behavioral economists find: these decisions may be optimal given their environment. Not because they are stupid. Because the constraints they face are completely different from the rich.

III. In 2013, Harvard economist Sendhil Mullainathan and Princeton psychologist Eldar Shafir published the book Scarcity. They proposed the scarcity mindset model. The core idea is: scarcity itself changes how the brain operates.

IV. When you are in a scarce state, short on money, time, or food. Your cognitive resources are forcibly requisitioned to handle the immediate crisis. You have no bandwidth left for long-term planning. Your attention is trapped by the question: "How do I pay next month's rent?" You cannot weigh "spend now or invest" like a relaxed person. Scarcity itself is a cognitive tax.

V. They ran an experiment. One group imagined needing to pay a $3,000 car repair bill before answering questions. Another group imagined paying $300. Then they tested the two groups' cognitive ability. Result: among high-income people, there was no difference. Among low-income people, the group imagining $3,000 performed significantly worse. Just thinking about a financial stressor depleted their cognitive resources.

VI. This explains why poor people are more likely to make "short-sighted" decisions. Not because they are born short-sighted. Because their cognitive bandwidth is occupied by scarcity, leaving no room for long-term thinking. Short-sightedness is a symptom of scarcity, not the cause of scarcity.

VII. But there is a deeper layer: the poor's "short-sightedness" may be game-theoretically optimal.

VIII. Economics has a concept called the time discount rate. It measures how much you discount future value. If your time discount rate is 90%, then 100 a year from now feels like only 10 today. You would rather take 50 today than wait a year for 100. Poor people's time discount rates are often very high. This is often labeled "irrational".

IX. But if you consider the poor's real situation, a high discount rate is entirely rational. Why?

X. First, the future is uncertain. The poor live in highly unstable environments. Job today, unemployment tomorrow. Healthy today, sick tomorrow. Savings today, wiped out by an accident tomorrow. If the future is extremely uncertain, investing resources into the future is high risk. The rational move is to maximize certain gains now.

XI. Second, the marginal utility of savings is low. If you earn 3,000 a month and spend 2,800, you save only 200. One year of savings is 2,400, barely enough for one minor medical bill. This savings cannot protect you from major shocks. If savings cannot provide real security, why endure the pain of saving? When saving cannot change your fate, spending can be more rational.

XII. Third, maintaining social ties requires immediate spending. The poor rely mainly on social networks as safety nets, not bank accounts. If a friend needs help, you must show up. If you need help, you depend on reciprocity. Weddings, funerals, major family events, each requires a cash gift. Refusing to contribute damages your social capital and leaves you with no one to turn to in a crisis. These "wasteful" social expenses are high-return social insurance investments.

XIII. Evolutionary psychology offers another angle. The human brain evolved in scarce environments. Our ancestors did not know whether they could find food tomorrow. In that environment, "eat today" mattered more than "store for tomorrow". Because if you starve today, there is no tomorrow. A high time discount rate is a survival strategy written into genes.

XIV. Under what conditions does the rich person's "long-term thinking" emerge? Food abundance. Stable housing. Accessible healthcare. Reliable social safety nets. In that environment, the future is predictable, and investing in the future is safe. "Long-term thinking" is not a virtue. It is a privilege. Only those whose future is safeguarded can afford to allocate resources to the future.

XV. This also explains why the poor love lotteries. The expected value of a lottery is negative. That is math. But for the poor, a lottery provides the only conceivable path to a class jump. Saving will never be enough. Working harder will never outrun inflation. But a lottery, however slim, offers a "what if I win" hope. This is not stupidity. It is rationality under despair.

XVI. Yale economist Robert Shiller once said: lotteries are the "portfolio of the poor." The rich can absorb a failed startup, because they have a safety cushion. The poor cannot absorb any failure, because failure is disaster. Lotteries are the poor's only option that "cannot lose too much, but might win a lot." Between lotteries and despair, lotteries are the rational choice.

XVII. How will the AI era change this? AI may intensify polarization of scarcity. People with AI skills may double their income. People without AI skills may be squeezed into lower wages. More people will be pushed into scarcity.

XVIII. And AI-driven advertising and recommendation algorithms are precisely extracting value from scarcity psychology. They know what you lack. They use installment plans to reduce the pain of paying. They use limited-time promotions to create urgency. The poor's cognitive bandwidth is already narrow, and AI is squeezing it further.

XIX. Those who blame the poor for being "irrational" often have never experienced real scarcity. They do not know: rent overdue, a child sick, no idea where next month's money will come from. Under that pressure, "rationally planning long term" is a luxury. You have to survive today before you can talk about tomorrow.

XX. The behavior of the poor is not the problem. Their circumstances are. Change the circumstances, and behavior changes naturally. Studies show: when the poor receive stable income security, their time discount rates fall and their savings rates rise. The poor are not the problem. Scarcity is.

XXI. This has major policy implications. Preaching "the poor should save" does not work. Because under scarcity, saving is a second-best strategy. To change behavior, you must first change constraints. Increase income stability. Provide social safety nets. Reduce negative shocks. Only when the future becomes trustworthy does investing in the future become rational.

XXII. Next time you see poor people making "stupid" decisions, do not rush to judge. Ask yourself: if you were in that situation, what would you do? If your future was full of uncertainty, would you still "delay gratification"? If your savings could not change anything, would you still save? The poor's decisions are optimized outcomes under extreme constraints. Not irrational. They are bounded rationality. In the AI era, these constraints apply to more and more people.