How is Gross Domestic Product (GDP) calculated? The total consumption, investment, government spending, and net exports
The total consumption, used goods, investment, government spending, and net exports,
The total consumption, investment, government spending, foreign assets, and net exports,
The total of all illegal economic activity subtracted from the GNI plus net exports,

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.

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