Financial Literacy Course | Module 1: Buying a Car

Buying a Car: A Case Study in Incentives and Compounding

What you will learn, why it matters, and how to protect yourself

Introduction

What You Will Learn in This Module

In this module, we are going to walk through one of the most common and most misunderstood financial decisions most people will make in their lifetime: buying a car.

This is not a module about which car to buy or what brand is best. This is about understanding the financial mechanics underneath the purchase. Specifically, you will learn:

• Why focusing on the monthly payment is the single most expensive mistake people make

• How car dealerships actually make their money, and why that matters to you

• The difference between buying new, buying used, and leasing

• How financing markups work and how to avoid them

• A simple, repeatable process for making smarter car-buying decisions

Why This Matters

For most people, a car is the second-largest purchase they will ever make. And unlike a home, a car is a depreciating asset. It loses value the moment you drive it off the lot. That means every dollar you overpay, every unnecessary fee, every percentage point of inflated interest is money you will never get back.

And yet, most people spend more time researching which car to buy than understanding the deal itself. The financial system is designed to keep you focused on the monthly payment because that is where the profit is. This module will teach you to see past that.

Why You Should Listen

Along the way, I have personally bought about twelve cars. Ten of them were used, and most of them I still own. That experience is what this module draws on.

The principles here are not opinions. They are patterns I have seen repeated thousands of times across every kind of financial transaction. Cars just happen to be one of the clearest, most relatable examples.

Module Teachings

Section A: The Monthly Payment Trap

The single most common mistake people make when buying a car is walking into a dealership and thinking in terms of monthly payments.

Someone says, “I can afford $400 a month.”

That sounds responsible. But here is the problem: $400 a month can be manufactured. A dealer can reverse-engineer almost any monthly payment by adjusting three levers: the loan term, the interest rate, and the fees baked into the deal. Stretch the term from five years to seven. Add two percentage points to the rate. Fold in extras. Suddenly, that “affordable” payment is costing you thousands more than the car is worth.

The right question is not “What monthly payment can I afford?”

The right question is: “What is the right price to pay for this car?”

Financing is a separate decision. Price comes first. Always.

Scenario: The Monthly Payment Mistake

Meet Marcus and Denise

Marcus and Denise are both looking at the same car: a used 2022 SUV with a fair market value of about $25,000. Both have decent credit. Both earn similar incomes. But they approach the purchase very differently.

Analysis: Why Denise Came Out Ahead

Marcus paid $5,232 more than Denise for the exact same car. Here is how that happened:

• Price: Marcus accepted a price $3,700 above fair market value because he never anchored on price. He anchored on payment.

• Interest rate: Marcus financed through the dealer at 8.9%. Denise got pre-approved at a credit union for 5.2%. That 3.7 percentage point difference compounded over years.

• Loan term: Marcus stretched his loan to 84 months to hit his target payment. That meant more months of interest accruing on a larger balance.

• Outcome: Denise’s monthly payment was slightly higher, but she paid far less overall and owned the car free and clear two years sooner.

This is not a hypothetical edge case. This is how the math works on millions of car transactions every year. The monthly payment is not the cost. The total cost is the cost.

Section B: New vs. Used vs. Leasing

When it comes to acquiring a car, you have three basic paths: buy new, buy used, or lease. Each has very different financial implications.

New Cars

A brand-new car loses roughly 20–30% of its value in the first two to three years. That is called depreciation, and it is the single biggest hidden cost of buying new. You are paying a premium for the experience of being the first owner, but the car’s utility—getting you safely from point A to point B—is nearly identical to a car that is a few years old.

Leasing

Leases are structured to benefit the dealer and the leasing company. They are loaded with embedded fees: acquisition fees, disposition fees, mileage penalties, wear-and-tear charges. At the end of a lease, you have no equity. You have essentially rented the most expensive years of the car’s life. For the vast majority of people, leasing is the most expensive way to drive.

Used Cars: The Sweet Spot

My recommendation is a car that is roughly three to four years old. At that age:

• The steepest depreciation has already occurred, so someone else absorbed the biggest loss

• The car still has modern safety features, technology, and reliability

• You get the vast majority of a new car’s utility at a significantly lower price

• If you can pay cash, you avoid interest entirely

Scenario: Three Paths to the Same Car

Meet Jordan, Priya, and Sam

All three want an SUV. They all value safety, reliability, and modern technology. But each chooses a different acquisition method.

Analysis

Sam spent the least, owns the car outright, and can drive it for years with zero payments. Jordan is still making loan payments on a car that has already lost significant value. Priya spent the most per dollar of utility and has nothing to show for it.

This is the math. The lifestyle appeal of new and leased cars is real, but the financial cost is steep. Understanding that tradeoff is the point.

Section C: How Dealers Actually Make Money

Understanding dealer incentives is critical. Most people assume dealers make their money selling cars. In reality, the profit structure looks very different:

• New car sales: Thin margins. Dealers often make very little on the sticker price of a new car.

• Used car sales: Moderate margins. More room to mark up, especially on trade-ins.

• Service and maintenance: A major profit center. This is why dealers want long-term relationships.

• Financing and insurance products: Often the biggest single source of dealer profit on any given transaction.

The Financing Markup

Here is how it works. When you apply for financing through the dealership, they send your application to multiple lenders—JPMorgan, Ally, Capital One, and others. Those lenders might approve you at, say, 7%. But the dealer is often allowed to mark that rate up by 1–2 percentage points. So the salesperson comes back and says, “Great news, you are approved!” and shows you a payment based on 9%.

The dealer quietly pockets the spread. You never see the wholesale rate. You never know you are paying more than you had to.

That 2% difference might not sound like much. But on a $25,000 loan over six years, it can cost you well over $1,500 in additional interest. Multiply that across the cars you buy in a lifetime and it becomes a very real number.

Section D: What to Do Instead

The good news is that protecting yourself is straightforward. Here is the process I recommend:

• Research the car’s fair market value. Use Kelley Blue Book, Edmunds, or comparable listings in your area. Know what the car should cost before you walk into any dealership.

• Get pre-approved for financing. Go to your bank or, better yet, a credit union. Credit unions are not designed to maximize profits. They typically offer lower rates and more transparent terms. Walk into the dealership already knowing your rate and terms.

• Negotiate the price separately. Do not discuss your monthly payment target. Do not mention your financing until the price is finalized. Keep these as separate conversations.

• Compare the dealer’s financing to your pre-approval. Sometimes the dealer can beat your rate. Great. But now you have leverage and a benchmark. You are negotiating from strength.

• Watch for term extensions. If a dealer tries to lower your payment by stretching the loan to 72 or 84 months, that is not a deal. That is more interest. Be cautious of any loan term beyond 60 months.

If you do these five things, you will be better prepared than the vast majority of car buyers. It is not complicated. It just requires doing the work before you walk through the door.

Module Wrap-Up

The Core Lesson

Cars are one of the clearest examples of how the foundational concepts in this course play out in real life. Monthly payments obscure reality. Incentives shape outcomes. Compounding works against you quietly. And the system is designed to keep you focused on the wrong number.

But here is the good news: once you see it, you cannot unsee it. And the same framework applies far beyond cars. When you learn to ask “What is the right price?” before “What is the monthly payment?”, you start making better decisions about houses, education, and every major financial commitment.

The Do’s

• Do research the fair market value of any car before you visit a dealership

• Do get pre-approved for financing from a bank or credit union before negotiating

• Do negotiate the purchase price and financing as two separate decisions

• Do consider a used car that is three to four years old for the best value

• Do think about the total cost of ownership, not just the sticker price

The Don’ts

• Don’t tell the dealer what monthly payment you can afford

• Don’t finance through the dealership without comparing to a pre-approved rate

• Don’t accept a loan term beyond 60 months just to lower the payment

• Don’t lease a car unless you fully understand the embedded costs and are comfortable with them

• Don’t buy a brand-new car if your goal is financial efficiency