Value Added
What is Value Added?
Value added is the value of a firm's output minus the cost of the intermediate goods it used, and summing value added across firms gives GDP.
Value added represents the additional value created at each stage of production. It is calculated by subtracting the cost of intermediate goods from the value of output. Value added is used to calculate GDP because it avoids double counting the value of intermediate goods. By summing the value added at each stage of production, we can determine the total value of final goods and services.
Value Added: a worked example
A wheat farmer grows grain using no purchased inputs and sells it to a miller for $40. The miller grinds it into flour and sells the flour to a baker for $70. The baker sells finished loaves to shoppers for $120. Value added at each stage is output price minus intermediate inputs: the farmer adds $40 minus $0, or $40; the miller adds $70 minus $40, or $30; the baker adds $120 minus $70, or $50. Summing the three gives $40 plus $30 plus $50, which equals $120. Notice that $120 is exactly the market value of the final good, the bread. Adding the three sale prices instead gives $230, counting the same wheat three times and the same flour twice. The value added method and the final goods method agree because every intermediate sale is subtracted by the firm that bought it.
The mistake students make with value added
Students often subtract every cost a firm pays, including wages, rent, and interest, rather than only the intermediate goods purchased from other firms. That subtraction feels like accounting profit, so it is a natural move. But payments to labor and capital are themselves the value the firm added, and subtracting them would erase the wages and profits that GDP is supposed to count. If the baker pays $70 for flour, $30 in wages, and keeps $20, value added is $120 minus $70, which is $50, and that $50 splits into the $30 of wages and the $20 of profit.
Value Added questions
How do you calculate value added?
Value added equals the sale price of what a firm produces minus the cost of intermediate goods it bought from other firms. A furniture maker that buys $300 of lumber and sells a table for $800 adds $500. Wages, rent, and profit are not subtracted, because those payments are how the added value gets distributed. Summing value added across every firm in an economy produces GDP without counting any intermediate good twice.
Why does the value added approach avoid double counting?
Each firm subtracts exactly what it paid the firm before it, so every intermediate transaction cancels out of the total. When a miller pays $40 for wheat, that $40 leaves the miller's value added and stays only in the farmer's. Adding raw sales revenue instead would count the wheat once when the farmer sold it, again inside the flour price, and a third time inside the bread price.
Do firms subtract the machinery they buy when finding value added?
Machinery and other durable equipment are not subtracted. Value added removes only intermediate goods, meaning inputs used up in producing this period's output. A bakery subtracts the flour it turned into bread but not the $40,000 delivery van it purchased, because national accounts treat that van as investment, a final good in its own right. Subtracting capital purchases would drop value added below the wages and profit the firm actually generated and would strip investment out of GDP.
Related terms
Common comparisons
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