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GDP is an income statement
Income without savings
Picture a person earning $200,000 a year. Their personal GDP looks great: they are paid for their work, they spend, and they likely get a raise every year. But a summary of paystubs and spending says nothing about savings or debt. With no savings, or with debt, things are worse than income and spending imply.
What companies publish
Public companies publish an income statement, a balance sheet, and a cash flow statement. Seeing what a company earns and spends without knowing what it owns, saves, and owes offers little insight into the value of the business. Warren Buffett often notes that he spends more time looking at balance sheets than income statements.
Why GDP wins
GDP wins on convenience. It rests on transactions, and transactions leave a paper trail. Net worth rests on valuations built from assumptions and educated guesses: what is a nation's natural resources, intellectual property, or AI models worth, or a property that has not sold recently? Standardized national accounting only took hold globally in the 1990s and is still being revised. GDP also misses unpaid work. A business that hires painters for a new office adds to GDP, and the same office painted by volunteers does not.
Why did GDP become the standard measure?
Economist Simon Kuznets built the first national income estimates for the US Congress in the 1930s, during the Great Depression, when policymakers had almost no reliable data. Wartime planning then pushed governments to adopt the framework, and the United Nations published its first System of National Accounts in 1953. Kuznets himself cautioned that a nation's welfare can scarcely be inferred from a measure of its national income.
How do statisticians value a house that hasn't sold?
They usually rely on the prices of comparable properties that did sell, adjusted for size, location, and condition. For the national total, many statistical agencies use a perpetual inventory method: they add up each year's investment in structures and subtract an estimate of depreciation. Tax assessments and surveys of owners fill in the gaps. Each of these steps rests on assumptions, which is why national balance sheets are revised as methods improve.
Why does GDP miss unpaid work?
GDP counts goods and services that are bought and sold, so work done at home or for free has no price to record. Cooking, cleaning, and caring for children and relatives all fall outside the headline figure. The US Bureau of Economic Analysis has published a satellite account that estimates the value of household production separately, and the amount it finds is a substantial share of measured GDP.
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