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The Psychology of Money — Why We Spend So Irrationally

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Opening — The Myth of the Rational Spender

Suppose you are a perfectly rational person. Then your choices in the following two situations should be consistent.

Situation A: You go to buy a movie ticket that costs fifteen thousand won, and you realize you have lost fifteen thousand won in cash from your wallet. Do you still buy the ticket?

Situation B: You bought the fifteen-thousand-won ticket in advance, and you lose that ticket right in front of the theater. Do you pay another fifteen thousand won to buy a new one?

In both cases you end up spending an extra fifteen thousand won. The size of the loss is identical. Yet when you ask real people, most say they would buy the ticket in Situation A, while a substantial number say they would just go home in Situation B. It is the same fifteen thousand won, so why does it feel different?

This small experiment is the doorway to the enormous question posed by behavioral economics. Traditional economics assumed people were Homo economicus, rational beings forever calculating their own interest coolly. But the real us is not that being. We feel the same amount completely differently depending on the situation, make irrational choices because we hate to lose what we hold, and let a single number we happened to see sway our judgment.

When you think about it, this is a strange thing. We consider ourselves fairly rational. We believe that, at least with money, we calculate carefully so as not to lose out. Yet when we look closely, our choices are far more often the product of intuition, emotion, and environment than we think. Behavioral economics explores exactly this gap, the distance between the self-image of being rational and how we actually behave. The field tells one uncomfortable but liberating truth: we are not the masters of our own minds as much as we think. And from knowing exactly that fact, the road to becoming a real master begins.

This essay explores why we behave the way we do around money. Let me be clear about one thing. This is not advice to buy a particular stock or how to invest. It is closer to a guide to understanding how our minds work. They say if you know the enemy and know yourself, you will not be in danger in a hundred battles. When it comes to money, the first opponent to know is the mind itself.

A Quick Note First

The word irrational tends to sound negative. But the habits of mind that behavioral economics has discovered are mostly not products of foolishness. They are clever shortcuts that helped our ancestors survive over a long process of evolution. It is just that those shortcuts sometimes produce odd results when they meet the complex financial environment of the modern world. So there is no need to scold yourself while reading this. If you can gain the ease of stepping back and observing, ah, so this is how my mind is shaped, that alone is enough.

1. Loss Aversion — The Pain of Losing Is Twice the Joy of Gaining

If you had to name one of the most famous discoveries in behavioral economics, it would surely be loss aversion. This concept, established by psychologists Daniel Kahneman and Amos Tversky, is simple: people feel gains and losses of the same size asymmetrically.

Concretely, it goes like this. The pain of losing ten thousand won is far greater than the joy of gaining ten thousand won. Across many studies, that difference has been measured at roughly twice. In other words, to offset the pain of a lost ten thousand won, you would need to gain something like twenty thousand won for your emotional balance to be restored.

Try a simple thought experiment. Someone offers you a coin toss. If it comes up heads you lose one hundred thousand won; if it comes up tails you win one hundred thousand won. The odds are exactly even. Would you take this game? Most people decline. Even though the expected value is zero, the pain of losing feels larger than the joy of winning. When researchers ask, then how much would the winnings have to be for you to play, many answer, you would have to give me about two hundred thousand won. That ratio is precisely the magnitude of loss aversion.

Loss aversion hides everywhere in daily life. The mind that cannot cut a losing stock and clings to it to the end, the mind that finds it too much trouble to return an item already bought, the mind swayed by the slogan you lose if you do not buy now. All of these come from the instinct to avoid loss.

In the stock market in particular, this phenomenon is well known as the disposition effect. People sell winning stocks too early to lock in a small profit, and hold losing stocks too long, letting the loss grow. Why? Because selling a winner brings the joy of locking in a gain, while selling a loser forces you to face the pain of locking in a loss. Our minds want to postpone that pain. While holding on, telling ourselves it will rise again, the loss sometimes grows larger. Rationally we should do the opposite, yet the instinct of loss aversion drives us backward.

One interesting point is that the same fact can feel like a loss or a gain depending on how it is framed. This is the framing effect. When a doctor says the survival rate of this surgery is ninety percent, versus the mortality rate of this surgery is ten percent, people choose differently. Though it is the same fact, hearing it in the gain frame of survival reassures, while hearing it in the loss frame of death makes us anxious. Marketers and politicians know the power of this framing well. So the same policy draws entirely different reactions when packaged as we are cutting your taxes versus we are taking away your benefits.

What is fascinating is that this instinct was, evolutionarily, quite rational. In an age when food was always scarce, losing what you had meant a threat to survival. Someone who clung tenaciously to what they had was more likely to survive than someone who chased new gains and squandered what they held. We are the descendants of such ancestors. The problem is that this instinct often makes us lose out in modern investing and spending decisions. A habit of mind that favored survival becomes, in an age of plenty, a stumbling block instead.

2. Mental Accounting — The Strange Ledger in Our Heads

The second concept to look at is mental accounting, developed by economist Richard Thaler. We manage money in our heads by dividing it into several imaginary accounts.

Money has no tags by nature. Ten thousand won is just ten thousand won no matter where it came from. In economic terms, it is fungible. Yet our minds do not work that way. We treat the same ten thousand won completely differently as ten thousand from the paycheck account, ten thousand of emergency money, and ten thousand that came as free money.

Consider a typical example. When a person who has scrimped all month wins one hundred thousand won in a lottery, that money suddenly becomes free money to splurge. They readily buy an expensive dinner that they could never afford to buy otherwise. It is the same one hundred thousand won, yet its use changes completely because the source is different. Rationally, this is strange. Whether it is one hundred thousand won won in a lottery or one hundred thousand saved from a paycheck, the fact that my assets grew by one hundred thousand is the same.

Another example is locking money into a use. Some people hold a savings plan while in debt at the same time, even though the interest on savings is lower than the interest on the debt. Purely by calculation, it would pay to break the savings and repay the debt. Yet people do not do this, because in their minds they manage a savings account and a debt account separately.

Another fascinating case is the difference between credit cards and cash. Even when spending the same amount, the pang of reluctance is far weaker when swiping a card than when counting out cash. A ten-thousand-won note leaving the wallet is a visible, concrete loss, but a card payment postpones and abstracts that loss into the future. In many studies, people tended to willingly spend more on the same item when paying by card. From the standpoint of mental accounting, the card makes spending easy by separating the pain of the moment of spending from the billing date. The fact that a single payment method can change our spending this much shows well how much we are swayed by the ledger of the mind.

Mental accounting is not always bad. In fact, it is also a useful psychological tool for managing money. Labeling money, like an account for life events, travel funds, or emergency money, can keep us from impulsively spending it elsewhere. The old way of running a household by splitting cash into envelopes is the physical version of mental accounting. The problem is that this ledger sometimes leads us to irrational choices. The key is not to eliminate the habit but to notice when it is operating. Used wisely, mental accounting can be made our ally; followed carelessly, it traps us. The same tool yields different results depending on the user.

3. Anchoring — Dropping Anchor on the First Number

The third concept is anchoring. When we make a judgment, the mind drops anchor on the first number it encounters and struggles to move far from it.

There is a classic experiment. Researchers had people spin a wheel of fortune. In fact the wheel was rigged to stop only at ten or sixty-five. After spinning, the researcher asked an entirely unrelated question: what percentage of UN member states are African countries? Astonishingly, people who saw ten on the wheel gave lower numbers on average, while those who saw sixty-five gave higher numbers. A meaningless number just seen influenced an utterly unrelated estimate.

This is not merely a laboratory phenomenon. Anchoring governs our spending lives. Suppose you see a price tag in a shop reading list price one hundred thousand won, sale price fifty thousand won. In truth we do not know precisely whether the item is worth fifty thousand. Yet the number one hundred thousand drops anchor, and fifty thousand feels very cheap. If the list price had been fifty thousand from the start, the feeling would have been entirely different.

The same holds in negotiation. The first price named becomes the reference point for the whole negotiation. Whether real estate or a used car, the haggling moves around the number first proposed. That is why a seasoned negotiator throws out the first offer carefully, knowing that number will drop anchor in the other party's mind.

Anchoring hides in menus, too. Think about why a restaurant places one very expensive dish at the top of the menu. It is not really trying to sell that dish in volume. Once that high price drops anchor, the mid-priced dishes below it suddenly feel reasonable. Compared to the fifty-thousand-won dish, twenty-five thousand seems about right. Had that fifty-thousand dish not existed, twenty-five thousand would have felt expensive too. We cannot evaluate price absolutely; we always feel it relatively, in comparison to something. Anchoring is the technique of quietly planting that very point of comparison.

The way out of anchoring is simple but hard. Forget the number presented and ask yourself, how much is this item really worth to me? Just noticing that an anchor has been dropped makes us a little freer. Escaping entirely is difficult. Humans are not built to judge value in a vacuum. But the mere habit of pausing once to ask, what number is dropping anchor in my head right now, makes the weight of that anchor noticeably lighter.

4. Money and Happiness — How Much Is Enough?

Now let us move to the most fascinating question. Does money make us happy? If so, how much, and up to what point?

This subject has long been studied, and the conclusion is subtle. Put simply, it is this: money affects happiness, but the relationship is not a simple straight line.

First, in the very low income range, money has a large effect on happiness. This is only natural. If you worry about meals, cannot go to the hospital when sick, and are chased by rent, then quality of life and happiness clearly rise as money increases. In this range, money is a powerful tool for relieving suffering.

But beyond a certain level, the story grows complicated. Once basic needs are met, more money does not raise happiness at the same pace. This is what economics calls diminishing marginal utility. The first loaf of bread is heaven to a starving person, but the tenth loaf brings little thrill.

Another trap that many happiness studies point to in common is adaptation. We grow accustomed to good things astonishingly fast. The new car bought after much deliberation, the dream house, all become ordinary daily life after a few months. The initial thrill fades, and we return to our previous level of happiness. Psychologists call this the hedonic treadmill. Like a treadmill that stays in place no matter how hard you run, happiness rarely rises permanently no matter how much more we own.

This adaptation is in fact a double-edged sword. On one hand it dulls us to good things quickly, keeping us from enjoying happiness for long; on the other hand it lets us adapt to bad things too, helping us recover. Even people who suffer great misfortune often show remarkable resilience over time. The human mind has a strong tendency to return to normal, whether toward the good or the bad. Knowing this changes one's attitude toward spending a little. The happiness from an expensive item fades faster than expected, and the pain of a small inconvenience grows familiar faster than expected. Then is making a strained, large purchase for the sake of happiness really a good deal? It is worth pausing once to think.

Another fascinating trap is comparison. Our happiness depends greatly on our relative position compared to those around us, rather than on absolute income. Receiving the same salary, we are satisfied if colleagues earn less than us and dissatisfied if they earn more. There is a famous analogy. If everyone stands on tiptoe to see the game better, in the end no one sees better and everyone's legs just hurt together. The competition of comparison is exactly like that. In the endless comparison of trying to get ahead of others, we own more yet do not become happier. The way out of this trap lies in turning the standard of comparison from outside to inside. Asking not am I better than others, but compared to yesterday's me, have I come closer to what I value.

So how should we spend money to come closer to happiness? Many studies on happiness give interesting hints. But it is better to take these as tendencies, not absolute laws.

  • Experiences over things. Money spent on experiences like travel or a concert tends to leave happiness longer than a new bag. Things grow familiar quickly, but experiences become memories to be relived again and again.
  • Money spent on others. In many experiments, people felt greater happiness spending on others than on themselves. A small gift or donation brings unexpectedly large satisfaction.
  • Buying time. There is research that spending money to remove disliked tasks like cleaning or delivery returns the saved time as happiness.
  • Anticipation and savoring. Counting the exciting time of planning before a trip and the time of recalling it afterward, the happiness of an experience lasts far longer than the actual moment.

Beneath all these findings runs one message. Happiness depends on how you spend as much as on how much you earn.

5. The Psychology of Impulse Buying — The Moment Your Hand Reaches the Cart

Everyone experiences it at least once: finding yourself standing at the checkout when you had no intention of buying anything. Impulse buying is not a simple problem of weak willpower. Behind it lie a refined psychological mechanism and a refined design of environment that exploits it.

First, look at how our brain works. When we face something we want, neural signals related to anticipation grow active in the brain. This signal is strongest before actually getting the item, that is, at the moment of anticipating. So shopping gives greater excitement in the process of debating whether to buy than in the act of buying itself. This is also why the thrill cools quickly once we actually buy.

The environment joins in here. Shops and online malls are designed to exploit our psychological habits precisely. Consider just a few.

  • Scarcity. Slogans like only three left or until midnight today stimulate loss aversion. The fear of losing the chance if you do not buy now provokes impulse.
  • Social proof. A label like a bestseller bought by ten thousand people touches the feeling that you should not be the only one left out when everyone else is buying.
  • Removing friction from payment. When payment ends in a single click, the sense of spending money thins. The reluctance felt when counting cash disappears.
  • Bundles and decoys. Showing an expensive option first and then recommending a middle option makes the middle feel reasonable. This is an application of anchoring.

One more thing to note is the influence of emotional state. We are more vulnerable to impulse buying when sad, lonely, or stressed, because shopping temporarily lifts the mood. This is often called revenge spending or mood-shopping. The problem is that the effect does not last. The comfort from the bought item soon vanishes, and regret often remains in its place. So the harder the heart, the better to postpone big decisions. Spending decisions made in a heightened emotional state are often ones the calmer me would not have made.

Knowing these mechanisms does not make impulse buying disappear entirely. But the moment we notice, we gain a chance to pause. One simple method many recommend is sleeping on it. Put what you want in the cart and wait a day. If you still want it the next day, after the excitement of anticipation has settled, it is not too late to buy then. Usually, by the next day, the desire has thinned like a mirage.

Another effective method is converting to time. Reframe the price of an item as the time you have to work to earn that money. Recalling, by hourly wage, this is five hours of my labor, the weight of impulse shifts considerably. The moment we convert money not into numbers but into the time of our lives, we gauge more clearly whether that spending is truly worth it.

6. The Psychology of Saving — My Future Self Is a Stranger

On the opposite side of impulse buying is saving. So why is saving so hard? Part of the answer lies in a psychology called present bias.

We weight present satisfaction far more heavily than future satisfaction. Ten thousand won today feels larger than ten thousand won a year from now. This itself is somewhat rational, since the future is uncertain. The problem is that the weighting is irrationally tilted. We feel our future self like a stranger, like a distant and hazy other. In one fascinating study, when people were asked to imagine their own future selves, their brains were observed to respond similarly to thinking of others. Enduring today for the sake of my future self is hard because, in a sense, it feels like enduring for someone else.

So what is the path to support saving? Behavioral economics recommends changing the environment rather than relying on willpower. There are several proven ideas.

  • Automation. Setting a fixed amount to move into savings the moment a paycheck arrives means you need not use willpower. It uses the principle out of sight, out of mind in reverse.
  • The power of defaults. People rarely change the default setting. In systems where saving is the default, savings rates are far higher. This is the power of a structure where enrollment is the default and you must separately apply to opt out.
  • Connecting with the future self. The more vividly and closely you feel your future self, the easier it becomes to save for them today.
  • Starting small. Setting aside a large amount from the start feels burdensome and is easy to abandon. Starting with a very small amount and building the habit lasts longer.

The important insight here is that saving is closer to a problem of structure than of personality. People do not save because their will is strong; people who have built an environment in which they cannot help but save do. Before blaming yourself, first try changing your environment.

There is one interesting case. One savings program chose the method of, instead of save more now, promise in advance to put part of your next raise into savings. This is effective because it cleverly bypasses our psychology. Taking money from the wallet right now feels like a loss and is painful. But promising to set aside a future raise not yet received does not feel like a loss. It is a design that, instead of confronting the instinct of loss aversion head-on, slips around it. Such clever devices give us an important lesson: rather than trying to fight and beat the habits of the mind, it is far more effective to understand them and route around them.

7. Attitudes Toward Money — How We Learned About Money

So far we have looked at universal psychological mechanisms. Yet there are deep differences from person to person, from culture to culture, in attitudes toward money. Where do those differences come from?

Much of it comes from childhood experience. Some grew up in a home where money worries never ceased; others grew up well-off but in an atmosphere that regarded talk of money as vulgar. Such early experiences are carved deep in the unconscious and quietly govern spending and saving habits in adulthood. Receiving the same salary, one person clutches it in anxiety, while another lets it flow, telling themselves it will work out somehow.

Cultural differences are large too. Some societies regard saving and frugality as virtues; others see appropriate spending and generosity as a sign of capability. There are cultures that consider talking about money openly natural, and cultures that treat money talk as taboo. There is no right or wrong in these differences. But it is important to know that the attitude toward money we feel to be obvious is in fact a product of the environment we grew up in.

A balanced view is needed here. A life that chases money excessively and a life that condemns money unconditionally are both tilted to one side. Money is in itself neither good nor evil. It is a tool. Just as a hammer can build a house or hurt someone, money becomes an entirely different thing depending on the values of the user. To avoid being swayed by money, we first need to look back on how we learned about money.

One interesting point is that anxiety about money is not necessarily proportional to the amount of money. Even people who have built great wealth can suffer endless anxiety, and there are people at peace though they do not have much. In the end, the relationship with money is not only a matter of the bank balance but also a matter of the mind. This is not a medical or psychological assertion but a life observation many people share.

Let us try a thought experiment here. If you suddenly came into more money than you could spend in a lifetime, would your anxiety disappear? For a while, perhaps. But the experience of many people says otherwise. New worries arise, the objects of comparison change, and expectations rise. There is certainly anxiety that money resolves, but there is also anxiety that money does not resolve. Trying to solve the latter with money, no amount of money is enough. For a person who cannot find an answer within themselves to the question of how much is enough, a sufficient amount never exists. Perhaps the final stage of learning about money is finding the definition of enough within yourself.

This kind of talk must not be heard as meaning money is not important. Money is clearly important. A lack of money truly produces great suffering and constraint. Romanticizing poverty is the luxury of someone who has never experienced it. What is meant here is the balanced view that money is neither the solution to every problem nor the source of all happiness. Taking money too lightly and taking it too heavily are both traps. Finding one's own healthy distance between them is the point that the psychology of money finally points to.

8. Behavioral Economics as a Lens — Nudges and Beyond

The findings we have looked at so far are part of a large current called behavioral economics. What makes this field special is that it told traditional economics, which assumed humans were perfectly rational beings, head-on that real humans are not.

This insight does not stop at academic curiosity. It has influenced policy and the design of institutions. A representative concept is the nudge. A nudge is a design that gently guides people in a better direction without forcing their choices. The automatic enrollment in savings seen earlier is a good example. It leaves freedom of choice intact while setting good defaults so people naturally make beneficial choices.

Examples of nudges are everywhere in daily life. Placing healthy food at eye level in a cafeteria leads people to choose it more. Behavior changes though nothing is forced. When such small designs add up, the behavior of an entire society can shift.

Of course, nudges come with debate too. Critics ask, who decides the better direction? Is gently guiding people not, in the end, manipulation? These are serious questions. Whether the power of the nudge is used in a good or bad direction lies in the hands of the one who designs it. The same psychological mechanism is used both to help people save and to spur impulse buying.

So perhaps the greatest benefit of learning behavioral economics lies in defense. If you know which buttons your mind responds to, you can notice attempts to press those buttons. Whether marketing or politics, the patterns of design that drive us toward particular choices begin to show. A person who knows the pattern is less swayed by it. This is the most practical gift the field gives.

9. So What Should We Do?

By now a natural question arises. If our minds are this irrational, what on earth should we do? Fortunately, the answer is not despairing. The key lies in going with the mind rather than trying to beat it.

First, awareness. Just knowing mechanisms like loss aversion, mental accounting, and anchoring is half the battle. If you can name it, this might be anchoring, this free-money feeling is a trick of mental accounting, a small gap opens between impulse and yourself. That gap creates room for a different choice.

Second, buying time. The bigger the decision, the more it should not be made on the spur of the moment. Allow a night for impulse buys, and a longer time of deliberation for big investments. An excited mind settles over time, and only then is calmer judgment possible.

Third, designing the environment. Willpower is a limited resource. Rather than fighting with will every time, it is far more effective to change the environment so good choices become the default. Small devices like automating savings, turning off app notifications that summon impulse buys, and waiting with a cart lighten the burden on willpower.

Fourth, connecting with values. Before spending money, ask, is this close to what I truly value? As seen earlier, the same money tends to leave happiness longer when spent on experiences, on relationships, on time. If you know what truly makes you happy, money becomes a tool toward that purpose.

To emphasize again, none of this is a particular investing method or a secret to getting rich. It is a guide to understanding your own mind better and forming a slightly healthier relationship with money. The first step in mastering money begins not with analyzing the market but with looking into one's own mind.

Closing — Again, the Movie Ticket

Let us return to the movie ticket from the opening. Buying the ticket when you lost cash, going home when you lost the ticket. Now we can understand the difference. Our minds place cash and the movie ticket into different mental accounts. Buying the ticket a second time feels like spending thirty thousand won from the movie account and seems expensive, while when cash is lost, that loss is separated from the movie account and the ticket still feels like fifteen thousand won. It is the same loss, but the ledger of the mind records it differently.

Is this foolish? It is not. It is simply human. We are people, not calculators, and our minds are full of refined shortcuts honed over millions of years. Those shortcuts usually help us, but sometimes take us to odd places.

Perhaps the greatest lesson the psychology of money gives us is humility. We are not as rational as we think. But knowing that fact is already a step ahead. A person who knows their own irrationality is a little freer than one who does not. There is no need to wish to become a perfectly rational human in the face of money. Only to know how your own mind is shaped, and to become a better friend to that mind. That is enough.

Things to Sit With

  • Recall a recent impulse purchase. Which mechanism (scarcity, social proof, and so on) was at work then?
  • Do you spend free money and a paycheck differently? If so, is that rational, or a trick of mental accounting?
  • Over the past month, what spending gave you the greatest happiness? Was it a thing, an experience, or something for someone else?
  • What method could make you feel your future self closer? Could that change today's saving?

A Small Quiz

  1. What is the phenomenon of feeling a loss more strongly than a gain of the same size?
  2. What is the psychology of treating the same money differently by source or use?
  3. What is the effect of judgment being pulled toward the first number seen?
  4. What is a design that guides people in a better direction without forcing their choices?

(Answers: 1. Loss aversion 2. Mental accounting 3. Anchoring 4. Nudge)

References

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