In recent months—and, in truth, for more than two decades—Americans have heard a familiar economic story: the economy grows, inflation rises and falls, wages adjust, and over time living standards improve. This narrative, reliably recycled by politicians seeking reelection and economists insulated from everyday pressures, obscures a more complicated reality.

But for many households, the lived experience has felt very different. Life has gradually become harder to afford—not suddenly, but steadily. Much like the proverbial frong on the stove in a pot of water, by the time the temperature reaches boiling point, it’s too late. 

The reason for this disconnect lies in how the economy is measured. Over the years, legacy economic statistics have lulled us into a false sense of security, while lived realities tell a different story. New data from the Ludwig Institute for Shared Economic Prosperity (LISEP) bring that long-term trend into sharper focus.

Between 2001 and 2024, the cost of maintaining a basic standard of living in the United States, measured by LISEP’s True Living Cost (TLC) Index, has risen 106%. The cost of achieving a Minimal Quality of Life (MQL)—one that allows not just survival but stability and modest opportunity—has risen 108%. Over the same period, the government’s primary measure of inflation, the Consumer Price Index, rose 77%.

That difference may sound technical, but in practice, it represents the widening gap between how the economy is often described and how it is actually experienced.

So why the discrepancy? The answer is fairly straightforward. Traditional inflation measures track price changes across tens of thousands of goods and services, from televisions to airline tickets. But the finances of working families are dominated by a much smaller set of unavoidable costs: housing, healthcare, food, transportation, childcare, and basic household necessities.

Those are the categories the TLC tracks—the expenses families cannot easily avoid and that determine whether a household can maintain basic stability.

The MQL goes further. It incorporates the costs required not just to get by but to modestly participate in modern American life: saving for education, modest leisure, and the basic investments that allow families to move ahead rather than merely tread water.

When viewed through that lens, the economic story of the past two decades looks very different. The cost of essentials has increased at a rate of 3.2% per year, outpacing the 2.5% rate for overall consumer prices.

Housing alone has become dramatically more expensive, especially for renters. Between 2001 and 2024, shelter costs increased from 23% to 29% of total spending for the average renter, while remaining stable at 18% for homeowners. In 2024 alone, housing costs within the TLC rose 10.6%, one of the largest annual increases in more than two decades. Childcare rose 7.7%, the largest increase on record.

Even as headline inflation cooled, these essential costs continued to strain household budgets. When officials declare victory over inflation, they are measuring the rate of increase—not the accumulated price levels that families already cannot afford.

These increases are not isolated events. They are part of a long-term pattern in which the most unavoidable household costs rise faster than overall inflation.

Even in 2024, when inflation cooled relative to previous years, these costs continued to outpace wage growth. Median weekly earnings for full-time workers rose 3.9%, while both the TLC and MQL increased 4.4%, resulting in a modest but meaningful erosion of purchasing power.

Over time, small annual gaps like these compound into something much larger. Since 2001, the median full-time worker’s earnings have declined 5.5% after adjusting for the TLC. According to the latest LISEP data, the cost of achieving a minimal quality of life in 2024 was about $47,100 for a single adult and $121,100 for a family of four.

Those figures represent something important: the cost not merely of survival but of living with basic economic security in modern America. For many families, that threshold has moved steadily further away.

The American economy has produced extraordinary growth and innovation since 2001. Yet the cost of participating in that economy—of maintaining stability and building opportunity—has risen even faster for many households.

Understanding that reality is not about pessimism, ; it’s about measurement.

The more accurately we understand the long-term pressures facing American families, the better positioned we will be to design policies that support both economic growth and broad prosperity. After all, as Adam Smith observed more than two centuries ago, no society can truly flourish if most of its people struggle to afford the basic necessities of life.

That is precisely why how we measure the economy matters. Policymakers rely on economic data to guide decisions about employment, taxes, social programs, and the broader direction of economic policy—a gap between the economic story Americans hear and the one they live inevitably breeds frustration. Understanding the real cost pressures facing households is therefore not merely a statistical exercise—it is a prerequisite for rebuilding confidence in our economic institutions.

The newly released 2024 data simply reinforce a lesson that has been building for more than two decades: For many Americans, the challenge is not whether the economy is growing, but whether everyday life within that economy remains affordable for them.

The opinions expressed in Fortune.com commentary pieces are solely the views of their authors and do not necessarily reflect the opinions and beliefs of Fortune.