Imagine you’ve worked, saved birthday money, and passed up a few smaller purchases until you’ve accumulated $500. Then you find something you really want, and it costs almost exactly $500.
You have the money. So you can afford it, right?
Technically, yes. But “Can I afford it?” is only the beginning of the decision.
If you spend your $500, you’ll have the thing you wanted—but you’ll no longer have the $500. Was it worth it? Was it the best use of the money? Is it something you need, something you want, or simply something you’ve been wishing for? What else could you have done with that money? And if you knew that saving or investing it could allow it to grow into a larger amount later, would that change what you choose to do today?
Those questions introduce one of the most important ideas in economics and personal finance: opportunity cost.
What Are You Really Giving Up?
Money is a limited resource. Once you use a dollar for one purpose, that same dollar cannot also be used for something else.
Suppose you have $500 and three choices. You could buy a guitar you’ve wanted and may enjoy playing for years. You could use the money for a trip with people you love and create memories you’ll carry with you for the rest of your life. Or you could invest the $500 and give it an opportunity to grow for your future.
Which choice is right?
There isn’t enough information to answer that question—and that’s the point.
The guitar isn’t automatically a waste of money because it doesn’t produce a financial return. The trip isn’t irresponsible because the money will be gone when you get home. And investing isn’t automatically the best decision simply because you expect the money to grow.
Each choice has value, and each has a cost. If you buy the guitar, you give up the trip and the investment opportunity. If you take the trip, you give up the guitar and the future value of the invested money. If you invest, you give up whatever enjoyment or experience that $500 could provide today.
Opportunity cost is the value of what you give up when you make a choice.
Understanding it doesn’t tell you what to choose. It helps you understand what you’re actually choosing.
Saving Everything Isn’t the Answer Either
Once you understand that money can grow, it’s tempting to think the financially responsible answer is always to save and invest as much as possible.
It’s not.
We shouldn’t live our entire lives saving for some distant day when we’re finally allowed to enjoy what we’ve accumulated. There’s no luggage rack on a hearse. Money is useful precisely because it can help us live, experience things, solve problems, help others, and pursue what’s important to us.
The goal is balance.
Saving $500 for the future has an opportunity cost just like spending it today. Perhaps that $500 could have paid for an experience with someone you love who won’t always be here. Perhaps it could buy a tool that allows you to develop a skill you’ll enjoy for decades. Those things have real value even though they don’t appear on an investment statement.
Good financial decisions aren’t necessarily the decisions that leave you with the most money. They’re decisions made with an understanding of the alternatives and consequences.
Every Decision Affects the Next One
One of the biggest financial mistakes we can make is treating each decision as if it exists by itself.
It doesn’t.
Buying something today changes how much you have available tomorrow. Taking on a monthly payment changes what your future income can be used for. Saving for one goal may delay another. Borrowing money may allow you to buy something sooner, but the interest you pay increases its real cost. Investing money gives you an opportunity for growth, but it also exposes that money to uncertainty and potential loss.
Financial decisions are connected.
That’s why simply asking whether you have enough money to make a purchase isn’t enough. A better question is:
If I make this decision, what does it mean for everything else I’m trying to accomplish?
You don’t need unlimited information to answer that question. In fact, more information isn’t always better. Gather enough relevant information to understand the decision, consider the alternatives and consequences, and then decide. Endless research can become its own way of avoiding a choice.
Give Every Dollar a Job
One way to make better decisions is to create simple systems before emotions get involved.
When you receive money, consider the jobs it might perform: save or invest, spend, or give. You don’t need a rule telling you that a certain percentage must go into each category. Your circumstances and goals will change. The important part is deciding intentionally rather than wondering later where all your money went.
It also helps to keep track of your needs, wants, and wishes. Needs are the things required for everyday life and your responsibilities. Wants improve your life or provide enjoyment. Wishes are often larger things or experiences you hope to have someday.
A want isn’t automatically bad. A need isn’t automatically a good purchase at any price. A wish isn’t necessarily unrealistic. These categories simply help you understand what role something plays in your life so you can decide how much of your limited resources it deserves.
Every dollar has a job. Make sure you’re the one assigning it.
Think Abundantly, but Act Efficiently
Economics begins with an uncomfortable reality: resources are scarce. At any particular moment, you have a limited amount of money and time. You can’t use the same resources for everything you want.
But recognizing scarcity doesn’t mean you need to live with a scarcity mindset.
The $500 you have today isn’t necessarily the last $500 you’ll ever have. You can work. You can learn. You can develop valuable skills. You can become more productive. You can start a business, solve problems for other people, save, invest, and continue creating value throughout your life.
An abundant mindset doesn’t mean pretending resources are unlimited. It means recognizing that your current resources don’t define your future possibilities.
That’s why the goal isn’t to clutch every dollar tightly because you’re afraid you’ll never get another one. The goal is to use the resources you have intelligently while continuing to develop your ability to create more.
Don’t Confuse Stuff With Wealth
This becomes especially important when you start comparing yourself with other people.
It’s easy to notice the shiny things: a new truck, a large house, a boat, expensive clothes, the newest phone, or a great vacation. What you can’t see is the financial statement behind them.
You don’t know how much was financed. You don’t know the monthly payments. You don’t know how much someone has saved or invested. You don’t know whether they could comfortably afford what they purchased or whether they’re struggling to make the payments.
Possessions are visible. Net worth, debt, and financial freedom usually aren’t.
Wealth is also more complicated than simply accumulating the largest possible pile of money. A person can earn a tremendous income and still create a lifestyle that requires nearly every dollar of it. Someone else can accumulate enough resources that financial demands no longer dictate every decision.
A useful way to think about wealth is this: money increasingly gives you choices instead of constantly making choices for you.
You may still choose to work because you enjoy it, find meaning in it, or want to accomplish more. But financial independence can eventually give you greater control over how you spend your time and money. Intelligent decisions made early in life can help create that freedom later.
Different Money Has Different Jobs
Not all savings should be treated the same way.
Money you expect to need soon has a different purpose from money you’re setting aside for decades. Investments with greater expected long-term returns generally come with greater uncertainty and the possibility of significant losses along the way. That’s manageable when you have many years before you need the money. It’s a serious problem if you’re saving for a car you’ll need next year and the value of your investment falls just before you’re ready to buy it.
Short-, intermediate-, and long-term goals therefore require different strategies.
This is another example of why financial decisions should be made holistically while still recognizing that each decision is unique to its purpose. The right place for a dollar depends on the job that dollar needs to perform.
Money Can Create Value for Someone Else, Too
Giving is another possible job for your money.
There isn’t a universal percentage you need to give away. But choosing to help someone, support a cause you care about, or simply brighten another person’s day can be a meaningful use of money. Research on generosity and prosocial spending has also found a positive relationship between helping others and our own well-being.
Giving has an opportunity cost, too. When you give $20 away, you’ve chosen not to spend, save, or invest that $20 for yourself. That’s part of what makes generosity meaningful.
Money can create value in your life. Sometimes it can create even more value when you use it to improve someone else’s.
Make Some Mistakes While They’re Cheap
If you’re young, you have an advantage you may not appreciate yet: your financial mistakes can still be relatively inexpensive.
Spend $50 on something you thought you’d love and discover two weeks later that it was a waste of money? That may be a valuable lesson.
The regret causes you to think differently before spending the next $50—or eventually $500, $5,000, or $50,000.
I’ve learned some of my best lessons from poor decisions. The objective of financial education isn’t to prevent young people from ever making a mistake. It’s to shorten the learning curve so those lessons happen while the consequences are manageable.
Parents have an important role here, too. Money has been a taboo subject in too many families, sometimes because of embarrassment, pride, fear, or simply habit. But if children aren’t allowed to observe financial decisions and make some of their own while growing up, they may face their first significant decisions alone when the stakes are much higher.
Kids can be included appropriately when a family creates a budget, buys insurance, purchases or sells a home, prepares tax documents, develops an estate plan, or makes other everyday financial decisions. They don’t need every private detail. They need exposure to the process of making responsible decisions.
Own Your Decisions
Good financial education shouldn’t tell you what you’re required to value.
My job isn’t to tell you that buying the guitar is wrong, taking the trip is irresponsible, or investing the money is always best. Those are your decisions.
Your responsibility is to understand them.
Consider the opportunity cost. Gather enough useful information. Think about how today’s decision affects your other goals. Use systems to keep short-term emotions from making every decision for you. Understand what you’re giving up. Then make your choice and accept responsibility for the outcome.
Sometimes you’ll make a great decision. Sometimes you’ll waste some money. Learn from both.
Each decision matters because each one helps shape the choices available to you next.
Think abundantly. Act efficiently. Own your decisions.