Why Your Brain Is Terrible With Money (And What To Do About It): An Intro to Behavioral Finance

Episode Summary: You've read the personal finance books. You know you should save more, spend less, and invest consistently. So why don't you? The answer isn't willpower — it's your brain. In this episode, we're breaking down behavioral finance: what it is, where it came from, why it matters, and how understanding it can literally change the way you handle money forever. Buckle up, because this one is a game-changer.

What You'll Learn:

• What behavioral finance actually is (in plain English, no PhD required)
• Why traditional economics got humans completely wrong
• The two "brain systems" that control every financial decision you make
• The biggest behavioral biases that are costing you money right now
• How to use behavioral finance in your favor to build better money habits

Key Terms Mentioned:

• Behavioral Finance
• Traditional/Neoclassical Economics
• The "Rational Actor" (homo economicus)
• System 1 vs. System 2 Thinking (Daniel Kahneman)
• Loss Aversion
• Mental Accounting
• Present Bias
• Herd Mentality
• Anchoring Bias
• Prospect Theory

People Mentioned:

• Daniel Kahneman — Nobel Prize-winning psychologist, author of Thinking, Fast and Slow
• Amos Tversky — psychologist and Kahneman's research partner
• Richard Thaler — Nobel Prize-winning economist, author of Nudge

Books Mentioned:

• Thinking, Fast and Slow — Daniel Kahneman
• Nudge — Richard Thaler & Cass Sunstein
• Misbehaving — Richard Thaler

Action Step This Week: Think about one financial decision you've been avoiding or one habit you keep failing to build. Write down why you think you keep struggling with it. Now ask: is it a knowledge problem or a behavior problem? Chances are, it's behavior. That's your homework.

Connect & Subscribe: If this episode made your brain light up, share it with one person in your life who needs to hear it. Leave a review — it helps more than you know!

Transcript

SPEAKER_00 0:05

Hi everyone, welcome to Personal Finance with Molly, where we talk about all things personal finance. I am your host, Molly Ford Coates. Let's dig in.

Intro

SPEAKER_00 0:23

Hey, hey, hey! Welcome back to the show. I am so glad you're here today because this episode has been sitting on my list for a while, and I've been waiting for just the right moment to do it justice. Today we are going back to basics in the best possible way. We're talking about behavioral finance, what it is, where it came from, why it explains basically every dumb money decision you've ever made, including mine. Don't worry. I'm not letting myself off the hook here. And why understanding it is honestly one of the most powerful things you can do for your financial life. Now, I know what some of you might be thinking, behavioral finance, that sounds like a college lecture. But I promise you it is not. It is the opposite of boring. In fact, by the end of this episode, you're going to be looking at your own spending and saving habits in a completely different way. You're going to have one of those moments where you go, Oh, oh, that's why I do that. So let's dig in.

The Problem With "Rational" Humans

SPEAKER_00 1:38

So this podcast is all about behavioral finance, right? Where your money, your mindset, and your behavior intersect. And I talk about behavioral finance a lot. I throw the term out there a lot in like every episode, but I want to actually get into what is it, which is why we're going back to basics today. So let me start with a quick story. Imagine you're at the grocery store and you see two checkout lines. One line has six people in it, the other has four. You pick the line with four, obviously. Simple math, right? But then, and you know this has happened to you, just like it's happened to me, and it feels like every time, that line with four people somehow takes twice as long. And instead of just being patient, you start doing this thing where you crane your neck, you sigh loudly, you consider switching lines, you do the mental math of whether switching will help you or hurt you. And by the time you're out of the store, you're somehow more stressed than when you walked in. Here's the thing. From a purely rational standpoint, you made the right call at the time with the information you had, but your brain didn't experience it that way. Your brain turned a totally normal grocery store trip into a minor emotional event. Now, multiply that by every financial decision you make. Every time you check your investment portfolio and feel a stomach drop, every impulse purchase you rationalize, every time you say, I'll start saving next month, and you start to see the problem. For a long time, economists assumed that humans were basically rational calculating machines. They called this theoretical person, and I love this term, Homo economicus, Latin for economic man. The idea was that people always act in their own best interest, always weigh the costs and benefits logically, and always make decisions to maximize their own utility. It sounds reasonable on paper, and for building economic models, it was actually pretty useful. But there is one tiny problem. Actual humans don't act like that at all. Like anyone who has ever eaten an entire bag of chips while knowing full well they had a salad at home is not going to act like a homo economicus. Anyone who has ever avoided looking at their credit card statement is not a rational economic actor. Real people are emotional, we're contradictory, we're easily influenced, and sometimes we are just straight up weird about money. So a bunch of very smart researchers started asking, what if instead of assuming people are rational, we just studied what they actually do? And that, my friend, is where behavioral finance was born.

What Is Behavioral Finance?

SPEAKER_00 4:54

So here's your definition. Nice and clean. Behavioral finance is the study of how psychology influences financial decision making. That's it. That's the whole thing. The study of how psychology influences financial decision making. It's the intersection of psychology and economics, asking the question: why do people make the money decisions they make? And why do those decisions so often deviate from what logic would suggest? Now, behavioral finance isn't just a fun academic theory. It has enormous real-world implications. It helps explain, one, why people panic sell their investments during a market crash, even when they know they're locking in losses. It helps to explain, two, why lottery ticket sales go up during economic downturns. It helps to explain why you'll spend an extra 20 minutes driving across town to save $10 on a $30 item, but won't blink at a $10 upcharge on a $3,000 appliance. And it helps to explain why people leave free money on the table by not enrolling in their employer's 401k match. These aren't random quirks, they're patterns, deeply consistent patterns in human behavior. And once you understand them, you can start working with your brain instead of constantly fighting against it. Now, where did this field come from? Let's talk about the origin story because it's actually a pretty great one.

The Origin Story: Kahneman & Tversky

SPEAKER_00 6:32

So picture this: it's the 1970s. Two psychologists at Hebrew University in Jerusalem, Daniel Kahneman and Amos Toversky, start doing research together. And they are fascinated by one question. When humans make judgments and decisions, what kind of systematic errors do they make? Not random errors, systematic ones. Errors that happen over and over again in predictable patterns. They start running experiments, and what they find is mind-blowing. People consistently make decisions that violate the rules of rational choice theory. And not in random ways, in very specific, very predictable ways. In 1979, they published a paper called Prospect Theory, an Analysis of Decision Under Risk. Now, I know that title doesn't exactly scream beach read, but this paper was seismic. It basically proved that people don't evaluate outcomes in absolute terms. They evaluate them relative to a reference point, and they feel losses much more intensely than the equivalent gains. We'll get into that more in a second. It's called loss aversion, and you've heard me talk about this, but it is so important. So, a few decades later, an economist named Richard Thaler started applying these psychological insights directly to economics and finance. He wrote books like Nudge and Misbehaving, two great reads, and he developed the concept of nudge theory, the idea that you can design systems that gently steer people toward better choices. And in 2017, he won the Nobel Prize in Economics. Kahneman had already won the Nobel in 2002, and he was a psychologist, not even an econom, not even an economist. That's how big of a deal this was. So behavioral finance didn't come from Wall Street, it came from people watching how regular humans actually think and make choices. And that's exactly why it's so useful for your financial life.

Your Brain On Money: System 1 Vs System 2

SPEAKER_00 8:51

Alright, here's where things get really interesting, friends. And I want you to think about your own brain as I walk through this. In his book, Thinking Fast and Slow, Daniel Kahneman describes two systems of thinking that every human brain uses. System one is fast, it's automatic, it's emotional, it's intuitive. It's the part of your brain that catches a ball, or reads a facial expression, or feels immediate dread when you see a bill you forgot about. System one doesn't deliberate, it just reacts. System two is slow, it's deliberate, logical, and it's effortful. It's the part of your brain that does long division or carefully reads a contract or thinks through whether you should actually buy that car. System two requires concentration. But here's the thing: system two is exhausting. Your brain does not want to use system two any more than it has to. So it outsources as many decisions as possible to system one. And that's fine when you're doing something like driving a route you've driven a thousand times. But when it comes to money, system one can be really, really bad at this. Because money decisions are often complex and require weighing long-term consequences. They're also emotionally loaded, and money decisions are often made in environments specifically designed to get you to spend more. Looking at you, every website with a limited time offer countdown clock. When system one is running the show on your finances, you get impulse buys, you get panic cells and a retirement account you haven't looked at in two years because something about it just makes you anxious. Behavioral finance helps you understand when System One is hijacking your financial decisions and how to bring System Two back into the driver's seat.

The Big Biases: The Greatest Hits

SPEAKER_00 10:57

Alright, so now we're gonna go through the greatest hits of behavioral finance biases. These are the most common, most documented, and honestly most relatable ways that our brains mess with our money. I want you to listen to these and just recognize yourself. It's okay. We are all in this together. So I have five biases. And you've heard me talk about these in other episodes, but I'm just bringing it all together for this one. So bias one, loss aversion. This is the big one, friends. The research shows that losing $100 feels about twice as bad as gaining $100 feels good. Let that sink in. The pain of loss is psychologically more powerful than the pleasure of an equivalent gain. This is why people hold on to losing stocks way too long, because selling would mean making the loss real. It's why people are more motivated by you'll lose this discount if you don't buy it now, then you'll gain a discount if you buy it now. It's why investors panic sell during market downturns, even though history shows staying the course almost always wins. Loss aversion is probably costing more people more money than almost any other bias. Know it, name it, and then question whether you're making a decision out of fear of loss versus rational analysis. Bias two, present bias. And here's a fun one. Would you rather have a hundred dollars or a hundred and ten dollars in a week? Most people say a hundred dollars, even though $110 in a week is objectively more money. Now, would you rather have a hundred dollars in fifty-two weeks or $110 in $53 weeks? And here, most people say $110 in 53 weeks, even though the waiting period is identical. It's just one extra week. So, friends, that inconsistency there, that's present bias. We dramatically overvalue the present versus the future, which is why retirement savings is so hard. Your future self is basically a stranger to your current brain, and your current brain would rather have the immediate reward. This is also why I'll start saving next month is one of the most expensive sentences in personal finance. All right, bias number three, mental accounting. This one is wild. Mental accounting is when we treat money differently depending on where it came from or where it's earmarked, quote unquote, in our heads, even though a dollar is literally always just a dollar. Classic example, tax refund money. And we're in April bringing up tax refunds here. So classic example is your tax refund money. People routinely spend their tax refunds on vacations or splurges. But why? It's your money, you earned it, it's not a windfall, it's just your own paycheck that the government held on to for too long. And yet, because it shows up as a lump sum, it feels like found money and we treat it differently. Or have you ever put money in a vacation fund savings account and then also carried credit card debt? Rationally, you should pay off the debt first because the interest rate is higher. But mentally, you've already decided what that money is for. Mental accounting isn't always bad, friends. Earmarking can actually be a useful hack, but it's worth knowing when it's tripping you up. All right, bias number four, anchoring. This is the one that salespeople know about and use against you constantly. Anchoring is when the first number you see in a negotiation or purchase decision becomes the reference point your brain evaluates everything else against. Like when you walk into a gualership, they show you the MSRP first, let's say $45,000. Then they offer it to you for $41,000. And you probably feel like you got a good deal, but your reference point, your anchor, was a number they chose strategically. You see this with was $200, now $79 pricing. The $200 is the anchor, the $79 feels like a steal. Whether or not $79 is actually a good price for that item, you're not even evaluating that anymore. In investing, anchoring shows up when people say things like, I'll sell when the stock gets back to what I paid for it. Why? That original price has no relationship to the stock's future value, but it's the anchor. And number five, herd mentality. Herd, H-E-R-D, herd, herd mentality. Last one, and this one is especially wild during market bubbles and crashes. Humans, we are deeply social creatures. We look to what other people are doing as information about what we should do. In most areas of life, this is actually pretty smart, but in financial markets, it can be catastrophic. Herd mentality is why crypto hit all-time highs right when every person's uncle and college roommate was texting them about crypto. It's why people bought beanie babies and tulip bulbs and meme stocks. Everyone was doing it, so it felt right. Warren Buffett's famous line applies here: be fearful when others are greedy and greedy when others are fearful. That is literally the opposite of what herd mentality tells you to do. But it's the philosophy that has made him one of the most richest people in the world. So the five biases, right? Loss aversion, present bias, mental accounting, anchoring, and herd mentality.

So What Do We Do With All This?

SPEAKER_00 17:34

Okay, so now you know what behavioral finance is. You know the biases, and maybe you're sitting there thinking, well, great, Molly. Thank you. My brain is broken. Thanks for the depressing episode. No, no, no, no, no, no, no. This is actually the good news. Here's what makes behavioral finance so powerful compared to just traditional financial advice. Traditional financial advice assumes that you act rationally if you just have the right information. Behavioral finance understands that information isn't enough. You also need systems. You need to design your financial life in a way that works with your brain, not against it. So here's a few examples of ways that you can design your financial life. First, automate everything. You don't have to rely on willpower to save if the money never hits your checking account in the first place. Set up automatic transfers to savings and investments the day you get paid. Present bias is neutralized because you never had to choose to save, it just happened. Another example, rename your accounts. So instead of saying savings account, call it emergency peace of mind fund or freedom account or 2028 trip to Japan. Mental accounting is a real psychological force. Use it intentionally instead of accidentally. Another example, use commitment devices. Tell a friend your financial goal. Use an app that creates friction before you can access money. Future lock a portion of every raise before you get used to the higher income. Just make it harder to sabotage your future self. Another example, unsubscribe from your portfolio notifications. Seriously, checking your investments daily activates loss aversion constantly because markets are volatile. The best investors look at their portfolios the least. And another example, have a rule, not a decision. So instead of deciding whether to invest each month, have a rule. 15% of every paycheck goes to investing, for example. Rules bypass the deliberation that biases love to hijack. The point of this, friends, the point isn't to become perfectly rational. That's not possible. And honestly, that sounds exhausting. The point is to set up your financial environment so that the natural tendencies of your brain lead you toward good outcomes instead of bad ones.

Outro And the Takeaway

SPEAKER_00 20:22

Okay, so let's bring this home. Behavioral finance is the study of how psychology shapes the way we make our money decisions. It was pioneered by researchers like Daniel Kahneman and Amos Tversky and Richard Thaler, who showed us that humans are not the cold, calculating, rational actors that traditional economics assumed. We are emotional, we are biased, and we are totally predictable in our irrationality. The biggest biases to watch out for loss aversion, present bias, mental accounting, anchoring, and herd mentality, those five that I talked about earlier. And the biggest takeaway? Knowing about these biases is step one, but the real power move is using that knowledge to build systems that automate good behavior. So you're not relying on willpower and perfect rationality every single day. Because here's the thing I really want you to hear. You are not bad with money because you are weak or lazy or irresponsible. You are human. Your brain is doing exactly what it was wired to do. The game is to build a financial life that works with that brain, not one that constantly demands that you overcome it. And that's the promise of behavioral finance. And we are going to keep coming back to these concepts again and again on this show because once you see this stuff, friends, you can't unsee it. You got this, friends. Hey, thanks for listening to Personal Finance with Molly. That's a wrap on today's episode. And if this one hit home for you, please share it with someone who needs to hear it. Leave a review if you haven't already. Follow the show. It genuinely helps more people find the show. The action step this week is in the show notes. I want you to think about one financial habit you keep struggling with and ask yourself, is this a knowledge problem or is this a behavior problem? I'll see you in the next show. And remember, your brain is not your enemy, it just needs a little direction.