It's nice that you have your own definition. It's good to see independent thinking!
When the U.S. Government calculates GDP, imports are subtracted from GDP and exports are added. You may disagree with how the government calculates GDP, but this is how it is done.
This effect in obvious in the two most recently reported GDP numbers. The GDP in the 1st quarter of 2025 had a negative change due to front running of imports, and thus a large subtraction from GDP, to beat tariffs. The 2nd quarter of 2025 that was just reported, showed a +3.0% change in GDP due to greatly reduced imports. This effect was widely reported.
Copied from https://www.bea.gov/news/blog/2025-06-03/expenditures-approach-measuring-gdp:
".. Gross domestic product, the total value of goods and services produced within the United States minus the value of goods and services, or inputs, used in production, can be measured three different ways: 1) expenditures approach, 2) income approach, and 3) production approach.
The most well-known method for computing GDP is the expenditures approach, the sum of all domestically produced goods and services sold to final users1. This approach uses the formula found in economic textbooks “C+I+G+X-M” to calculate GDP:
- C is the value of goods and services sold to people.
- I is the value of business investment.
- G is the value of goods and services sold to the government.
- X is the value of goods and services the United States exported, or sold, abroad.
- M is the value of goods and services the United States imported, or purchased, from abroad. ‘M’ is subtracted from the sum of C, I, G, and X to ensure that GDP measures only the value of domestically produced goods and services. .."
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