NEW YORK, July 21 — The gap between the world’s wealthiest and everyone else is far starker than the gap in what people earn, according to definitions used by the International Association for Research in Income and Wealth. The association defines wealth as net worth — assets minus liabilities — and notes that its distribution is “much more unequal” than the distribution of income, which measures current earnings rather than accumulated ownership.
Think of it like the difference between a snapshot of what someone earns in a year and a lifetime photo album of what they actually own — houses, stocks, businesses — minus any debts. Income can fluctuate, but wealth tends to stick.
That stickiness is what makes the inequality so pronounced.
How inequality is measured
Economists use several yardsticks. One common metric is the share of total wealth held by the top 1% of the population. In many societies, the richest tenth of households control more than half of all wealth.
The Pareto Distribution — a mathematical model often applied to the upper end of wealth — describes a pattern where the top 20% hold 80% of the wealth, the top 4% hold 64%, and the top 0.8% hold 51.2%. Another measure, the Kuznets ratio, compares the 99th percentile of wealth to the median (the P99/P50 ratio), and tends to follow an inverted-U shape when plotted against income per capita.
To visualize national wealth distribution, analysts use “Wealth over People” (WOP) curves. These sort households from richest to poorest. The topmost point of any WOP curve is, by definition, at (1% of people, 100% of wealth).
The rightmost point is at (100% of people, 0% of wealth) — representing households with no net worth. Two extreme theoretical forms exist: the “perfect communist” WOP, a straight horizontal line from the richest down to the 99th percentile, then a vertical drop to zero; and the “perfect tyranny” form, where a single tyrant holds all the wealth and everyone else has nothing.
Wealth vs. income: a practical difference
The relationship among wealth, income, and expenses is captured by a simple expression: change in wealth equals saving, which equals income minus consumption. So an individual can have a high income but also high expenses, and the net effect on wealth can be small or even negative. That matters for anyone trying to build a financial cushion — a high paycheck alone doesn’t guarantee a growing net worth.
The broader definition of “inclusive wealth,” used by the United Nations, includes natural, human, and physical assets. But the source notes this definition is rarely applied in measuring wealth inequality, so the standard focus remains on financial and physical assets.
What to watch next
Governments and researchers continue to rank countries using lists such as “List of sovereign states by wealth inequality” and “list of countries by wealth per adult.” As these metrics gain attention, the practical upshot for ordinary readers is that the distribution of wealth — not just income — is a key measure of economic heterogeneity. It’s a reminder that the assets people own, and the debts they carry, tell a far more complete story than the paycheck alone.
