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Old shells don't count as growth
How GDP is counted
GDP is meant to capture everything an economy produces in a year, but nobody can watch every factory and haircut in real time. So statisticians count where production ends up: household consumption, business investment, government spending, and exports minus imports. That is all the formula C plus I plus G plus X minus M describes.
Why old stock cancels out
A fridge built in December that doesn't sell until the following year still counts toward this year's GDP. It is recorded as the factory investing in its own inventory. When a stockpile is sold later, exports go up and inventory investment goes down by the same amount, so the two cancel. If the United States exported its entire strategic petroleum reserve tomorrow, its export figures would look spectacular and measured GDP would barely move.
North Korea's shells came out of warehouses and mountain bunkers filled over decades, so shipping an estimated 10 billion dollars' worth of them to Russia adds roughly zero to its GDP on paper. The food, fuel, and building materials that come back are imports, which get subtracted. A barter deal with old stockpiles flowing out and fresh imports flowing in could technically show up in the national accounts as the economy shrinking.
Where real growth shows up
Real growth shows up elsewhere. Unlike a petroleum reserve, North Korea can simply make more munitions. The Bank of Korea estimates its economy grew 3.1% in 2023 and 3.7% in 2024, the fastest rate in eight years, with heavy industry growing more than 10% as factories expanded output of the metal products that leave the country in crates.
Why does unsold inventory count as investment?
Statistical agencies treat a company that adds finished goods to its own shelves as if it had bought them itself. That keeps GDP a measure of what was produced in a year, regardless of when it sells. Without the entry, a fridge built in December and sold in January would vanish from the books in the year it was made. In the United States, the Bureau of Economic Analysis reports the change in private inventories as its own line in every quarterly GDP release.
Why are imports subtracted from GDP?
Spending on consumption, investment, and government already includes money spent on foreign-made goods. Because GDP is meant to count only what is produced inside a country's borders, imports are subtracted to remove that foreign output. The subtraction is an accounting correction, and it does not mean imports reduce what a country produces. Exports minus imports is reported as net exports, and countries that import more than they export show a negative figure there.
How does the Bank of Korea measure North Korea?
North Korea publishes almost no economic statistics, so the Bank of Korea builds its estimate from outside evidence. It draws on trade data reported by partner countries, along with information about harvests, mining, and industrial output. It then values that output using South Korean prices and cost structures. The bank has published these annual estimates for decades.
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