The Reckoning — The Stock, Plate iii

If the stock is the thing, economics needs two great accounts — a measure of the flow and a measure of the stock — and history built the flow account first. Before the 1930s no nation knew, in any systematic way, how much it produced; the figures that now open every newscast did not exist. It was Simon Kuznets, working for a young statistical bureau and then for the Congress of a country sunk in depression, who first measured a nation's income with rigor, and so created the flow account on which all modern macroeconomics rests. Yet Kuznets, more than anyone who came after, understood what his own creation could and could not say. He had measured the motion of production — a flow, counted to the dollar — and he warned, again and again, that this was not the same as the welfare of a people, nor as the wealth a nation had laid up. The plate is the story of the flow account and of the caution its author could never make the world heed.

The achievement was real and hard-won. To measure a nation's income is to add up, without counting anything twice, the value of everything it produces — every loaf and locomotive, every haircut and legal opinion — across an entire economy in a year. Kuznets and his collaborators built the methods from almost nothing: deciding what to include, how to avoid double-counting the flour in the bread, how to value goods that never reached a market, how to knit scattered industry data into a single national total. His 1934 report to the Senate gave the United States its first official reckoning of national income, and the framework, refined into gross national product and later gross domestic product, spread across the world. For the first time a government could see the size of its economy, watch it contract in a slump and expand in a recovery, and steer by the figure. It is difficult now to imagine economic policy without it; the measure made the macroeconomy visible.¹

1. The achievement was hard-won. To measure national income is to add up, without double-counting, the value of everything an economy produces in a year — every loaf and locomotive, haircut and legal opinion. Kuznets built the methods from almost nothing: what to include, how not to count the flour twice in the bread, how to value what never reached a market, how to knit scattered data into one total. His 1934 Senate report gave the US its first official national income; refined into GNP and later GDP, it spread worldwide. A government could now see its economy's size, watch it slump and recover, and steer by the figure. The measure made the macroeconomy visible.

But the figure is a FLOW, and Kuznets never let his readers forget how much a flow leaves out. National income measures the rate of production over a year; it says nothing about the stock of wealth a nation holds. A country can post a handsome income while running its stock down — exhausting its mines, felling its forests, letting its roads and bridges crumble — and the depletion will not show in the flow until the day the stock is gone. The income account records what is produced; it is silent about what is owned, and about whether the producing is being financed by building the national wealth or by consuming it. This is precisely the gap Boulding had named: the flow account, however well kept, is only half the books, and the half it omits — the stock — is the half that tells whether a nation is growing richer or merely busier.²

2. But the figure is a FLOW, and Kuznets stressed how much a flow omits. National income measures the rate of production; it says nothing about the STOCK of wealth held. A country can post a fine income while running its stock down — exhausting mines, felling forests, letting roads crumble — and the depletion will not show in the flow until the stock is gone. The income account records what is produced and is silent about what is owned, and about whether the producing builds the national wealth or consumes it. This is Boulding's gap: the flow account is only half the books, and the omitted half — the stock — tells whether a nation grows richer or merely busier.

⁂

Nor, Kuznets insisted, does the flow measure welfare. National income counts whatever is produced and sold, and counts it all as a positive, without asking whether it adds to human well-being or merely repairs a harm. The money spent cleaning up an oil spill, rebuilding after a flood, treating the diseases of pollution, or guarding against crime all swell the national income, though they only restore a state that some prior loss destroyed; the flow rises, but the nation is no better off. At the same time the measure ignores vast tracts of real economic activity that happen outside the market — the labor of the household, the care of children and the old, the work of the volunteer — counting them at zero because no price is attached, so that a nation can grow "richer" by the figure merely by moving into the paid market work that was once done unpaid at home. And the single national total says nothing of how the income is divided; a country may report a high average while most of its people see little of it. Kuznets put the caution as bluntly as he could: a measure of how much a nation produces is no measure of how well its people live.³

3. Nor does the flow measure welfare. National income counts whatever is produced and sold, all as a positive, without asking whether it adds well-being or repairs a harm — cleanup after a spill or flood, treating pollution's diseases, guarding against crime all swell it, though they only restore a prior loss. It ignores activity outside the market — housework, care, volunteering — counting them at zero, so a nation grows "richer" merely by moving unpaid home work into paid work. And the single total hides the division. Kuznets's warning, bluntly: how much a nation produces is no measure of how well its people live.

Kuznets was, at heart, a meticulous empiricist suspicious of grand single numbers, and his deeper objection was to the very reduction of an economy to one figure. The interesting facts, for him, lay in the COMPOSITION of the national income, not its sum: which industries produced it, how it was split between labor and property, how it was distributed among rich and poor, how it changed over the long sweep of decades. He spent his life disaggregating — breaking the total down by sector, by region, by income class, by epoch — and it was from this patient anatomizing, not from the headline aggregate, that his discoveries came, including the long-run patterns of growth and inequality that bear his name. He gave the world the single number under protest, knowing it would be seized upon precisely because it was single, and knowing that its very convenience would tempt every government and commentator to mistake the motion of production for the wealth and the welfare of a people.⁴

4. Kuznets was a meticulous empiricist suspicious of single numbers; his deeper objection was the reduction of an economy to one figure. The interesting facts lay in the COMPOSITION of national income, not its sum: which industries made it, how it split between labor and property, how it was distributed, how it changed over decades. He spent his life disaggregating — by sector, region, class, epoch — and his discoveries came from that patient anatomizing, not the headline total. He gave the world the single number under protest, knowing its convenience would tempt every government to mistake the motion of production for a people's wealth and welfare.

The flow account, then, is an indispensable half of economics and a standing temptation to error. It tells, with real precision, how fast a nation is producing; it cannot tell how much it has accumulated, whether the producing builds or consumes the national stock, or whether the people are any better off for it. To read welfare or wealth from the income figure is to commit, at the scale of a nation, the very stock-flow confusion the volume was built to expose: to mistake a rate for a level, the motion for the thing in motion. What is needed beside the income statement is the balance sheet — an account not of what a nation earns but of what it owns. That account, slower to arrive and far less watched, is the work of the next plate: the systematic reckoning of national wealth, the stock to set against Kuznets's flow. The next plate is the balance.⁵

5. The flow account is an indispensable half of economics and a standing temptation to error. It tells, precisely, how fast a nation produces; it cannot tell how much it has accumulated, whether the producing builds or consumes the stock, or whether people are better off. To read welfare or wealth from the income figure is to commit, nationally, the stock-flow confusion the volume exposes — a rate mistaken for a level. What is needed beside the income statement is the balance sheet, an account of what a nation OWNS. That account, slower and less watched, is the next plate. Next: the balance.

Simon Kuznets built the flow account of the modern economy — the systematic measure of national income that became gross domestic product, the figure the whole world now watches. It was a genuine achievement, making the macroeconomy visible and policy possible. But Kuznets understood, better than his successors, that the measure is a flow and only a flow: it records the rate of production, not the stock of wealth a nation holds, so that a country can report a fine income while quietly consuming its capital; and it counts whatever is produced as a good, repairs and harms alike, while ignoring all the unpriced labor of the home, so that it cannot stand as a measure of welfare. His own caution — that a nation's output is no gauge of its people's welfare — went unheeded precisely because the single number was too convenient to resist. The flow account needs the stock account beside it. The next plate is the balance.