GDP: The Ultimate Lie?

“What we measure affects what we do; and if our measurements are flawed, decisions may be distorted”

- Joseph Stiglitz -

GDP. Three letters that dominate headlines, drive government policy, and even move global markets. When it rises, leaders celebrate. When it falls, panic sets in. But here’s the catch: while GDP is treated like the ultimate scoreboard of prosperity, it doesn’t always tell the full story.

Sure, it tracks the value of goods and services produced within a country. But does it really capture whether people are healthier, happier, or thriving in the long run? Not quite. In fact, relying on GDP alone can sometimes paint a dangerously misleading picture — one that pushes policymakers to chase numbers instead of meaningful progress.

So, is GDP a reliable guide to a nation’s well-being, or just an overrated statistic with a good PR team? Let’s break down what it really measures, where it shines, and why it might be fooling us more than we think.

The Basics

Before breaking down what works and what doesn’t, let’s take a look at how it actually works. You’ve probably heard before that GDP measures the “total output of an economy”. But how exactly is this measured? Well, there are three approaches that should - in theory - yield the same results: the production approach, the income approach, and the expenditures approach.

In the production approach, the added value of a good or service is measured. Calculated as the gross output of goods and services minus the intermediate goods and services, this approach looks at the value added at each stage, across the whole economy.

In the income approach, the income of all agents in an economy is summed up - bet you didn’t see that one coming… In this case, the GDP = wages + profits + rents + (taxes - subsidies). One party’s income is another party’s expense, hence the GDP from the expenditures approach should be equal. In this approach, the most famous one in textbooks:

GDP = C + I + G + (X-M)

Or, in plain English, it’s the sum of private consumption (C), corporate investments (I), government spending (G), and the trade balance of a country (eXports - iMports).

Often, GDP is used as a representation of a country’s welfare. All countries seek GDP growth, sometimes at all costs. At first sight, this seems reasonable, right? How you want to measure it - through more room for expenses, more income, or more added value - all seem like signs of prosperity and growth. However, as always, there’s more under the hood than you’d think at first sight. Let’s take a look at the good, the bad and the ugly of the GDP…

Reliable…

If GDP is such an important and often-used measure, it has to be reliable, right? It surely has its pros. First of all, it’s a relatively simple measure: just sum up a bunch of data that’s relatively easy to gather, and voila. It’s a straightforward measure for gauging an economy’s growth. And, very important, it’s a quantifiable measure, meaning that it can be compared to other quantifiable measures. You might’ve guessed it, but that is where the debt-to-GDP ratio comes in. The debt-to-GDP ratio varies widely for different countries, especially among members of the G20:

Debt-to-GDP Ratios G20 - Source: Trading Economics

As you can see, it ranges from about 20% for Russia to about 240% (!) for Japan. For those of you who have never heard of this measure, let me explain. In theory, countries take on debt to do productive things with that increase the welfare of their people. Think of building railway stations, roads, and other investments that benefit the public. And just like you and me have to pay a certain rate of interest on our debt, so do countries. The riskier the country, the more interest investors will demand. This debt often comes in the form of government - or often risk-free - bonds. Some countries, like Japan and the US, are considered safe, and therefore have to pay less interest on their debt. The opposite is true for riskier countries, such as India.

Anyway, this debt-to-GDP ratio is influenced by two factors: debt and GDP itself. If a country takes on more debt without growing, the debt-to-GDP ratio will increase. If it grows faster than it takes on debt, the debt-to-GDP ratio will decrease. Hence, the goal is to strategically borrow, and grow. The faster, the better. In this way, GDP is a very useful measure to track on the one side the growth of a country, and combined with the debt-to-GDP measure, to see where the funding of this growth comes from.

It has also been evolving. Back when manufacturing was the norm, it was a simple measure in that focused much more on tangible value. The world has changed, and much more intangible value is being created. The best example is the inclusion of R&D. Whereas R&D was first considered an expense rather than an investment for companies, it’s now appropriate to consider it as such. Hence, it’s added to the “I” when calculating the GDP.

Now that you understand why it’s a decent measure, let’s confuse you some more and talk about why - beneath the surface - this can actually be a very misleading measure…

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…Or A Misleading Measure?

As Einstein once said: “Everything should be made as simple as possible, but not simpler”. And sometimes it feels like GDP is so overused and oversimplified that it misses a bit of nuance. Therefore, this article. You’re welcome.

First of all, it’s a measurement that has been and always will be subject to change that can affect it pretty significantly. An example is the inclusion of illicit activities. A few years back, the definition of GDP was changed so that it could include illicit activities as well. The result? The debt-to-GDP ratio of a lot of countries decreased overnight, simply because they could inflate their GDP measures. Nothing fundamentally changed, just the way the GDP was built up.

Additionally, it’s also very difficult to capture the non-quantifiable dimension of GDP. Examples that are often mentioned are the happiness and health of people. If everybody suddenly were to work 12 hours a day, GDP would likely rise by quite a bit, as the economy would experience a productivity boost. However, in the long run, this would depress and even kill people. Not measurable, but a very important nuance.

Another example is government spending. Government spending is included in the GDP, regardless of the outcome of that investment. When a government is very keen on growing, and increasing that GDP, it may take on a lot of debt. At first, this will fund projects that benefit the people. Useful railway stations, roads and hospitals will be build. After a while though, the essentials will be completed, but governments may still be “investing”. After all, they have to hit that GDP growth. The result? Investments that inflate GDP, increase debt, but barely increase the standard of living. Bad investments.

To summarize this section: GDP is a deceptively plain measure: good and simple on the outside,but when digging a bit deeper it’s clear that it sometimes consists out of value-destroying rather than value-driving activities.

Closing Remarks

At the end of the day, GDP is like a headline number on a scoreboard - flashy, simple, and easy to cheer for. But behind the big bold digits, the real story can look very different. A country can grow its GDP while its citizens grow more stressed, more unequal, and less healthy. Numbers don’t lie, but sometimes they don’t tell the whole truth either.

Joseph Stiglitz was right: when we chase flawed measurements, we risk making flawed decisions. And that’s why it’s time to stop treating GDP like the holy grail of progress. Yes, it’s useful. Yes, it tells us something. But prosperity is more than just a sum of transactions - it’s about quality of life, opportunity, and a future that feels worth investing in.

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📢 Do you believe GDP is still the best measure of economic success, or is it time for a new approach? Share your perspective in the comments below!

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Please note: This article includes a disclaimer regarding investment advice.

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