Can I interest you in a new Mercedes-Benz?

photo credit patruflo / Shutterstock.com

My husband drives a 2014 Mercedes-Benz C200. Its been very well maintianed and it looks every bit as good as when he first bought it. But there's nothing particularly rare or remarkable about it. Nobody is going to discover it in thirty years and declare it an important piece of automotive history. It is simply a well-made German sedan that has spent more than a decade doing exactly what it was designed to do.

He'd like a later model, yet he still likes this one.

I know because I've seen him look at the newer cars. He notices the larger screens, the updated interiors and all the refinements in styling that inevitably arrive after twelve years of development. For a moment, he imagines owning one. Then he gets back into the car he already has. And there's nothing wrong with it.

That small observation raises a surprisingly important financial question. Why do things that once felt valuable begin to feel less valuable simply because something newer appears beside them? Because that's often what happens. The new phone makes the old phone seem outdated. The renovated kitchen makes the existing kitchen feel inadequate.

The latest model car has a curious ability to make last year's model look older than it did the day before.

Yet in many cases, almost nothing has changed. My husband's Mercedes still starts every morning. The seats look just as new and are as comfortable as they were when he bought it. The air conditioning is no less effective because a newer dashboard now exists in a later model. Yes, its market value has fallen, but it's usefulness has not by anything like the same amount.

That distinction matters because we often confuse depreciation with deterioration.

Depreciation is what happens in the marketplace. Deterioration is what happens to the thing itself. The two are related, but they are not the same. A car can lose half its market value while still performing almost all of the functions that made somebody want it in the first place.

The same idea extends beyond cars. One of the hidden advantages of buying quality is that quality often survives long after novelty disappears. Eventually every purchase loses its shine. The excitement fades. The thing becomes ordinary. It simply becomes part of everyday life. But if it was chosen well and built well, it can continue delivering value long after the excitement has gone. In fact, every additional year of satisfactory use quietly improves the economics of the original purchase.

There is another benefit that is even easier to miss. Every year my husband keeps that Mercedes is another year he doesn't buy its replacement. We often ask what something is worth today. Sometimes the more useful question is what keeping it has prevented us from spending.

That changes the calculation considerably. Suppose the Mercedes is worth $15,000 and its replacement costs $70,000. It is tempting to compare a $15,000 car with a $70,000 car.

But that isn't really the decision. He already owns the $15,000 car. The actual choice is closer to this:

A Mercedes he already enjoys, plus $55,000.

Or a newer Mercedes he would probably enjoy somewhat more.

Viewed that way, the decision becomes much harder. Not because the newer car isn't better. It obviously and certainly is. The question is whether it is better enough. Money can only become one thing at a time. Spend it on a car and it cannot simultaneously reduce a mortgage, fund travel, build investments or provide security for the future. Every purchase competes with the alternatives. That doesn't mean upgrading is wrong. Sometimes a replacement genuinely solves a problem. The old thing has become unreliable, unsuitable or expensive to maintain. But there is a difference between a problem and a temptation.

There will always be a newer model. A nicer version. There will always be something designed to make what we own today feel slightly inadequate tomorrow.

Perhaps one of the more useful financial skills we can develop is learning to recognise the difference between deterioration and obsolescence. Has the thing actually stopped serving us well? Or has something newer simply arrived?

My husband may replace his Mercedes one day. But I don't think the fact that a better one now exists is, by itself, a compelling reason. His C200 is has lost most of its novelty. It has lost a great deal of its market value. What it hasn't lost is its ability to do almost everything he bought it for in the first place.

Ready to look at your money differently?

If the way we think about money interests you, Where Did All the Money Go? explores the behaviours, habits and decisions that shape our financial lives — and how small changes can create lasting momentum.