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In page Gross domestic product:

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If a country becomes increasingly in debt, and spends large amounts of income on debt interest expense, will be reflected in a decreased GNI[citation needed] but not a decreased GDP. Similarly, if a country sells off its resources to entities outside their country this will also be reflected over time in decreased GNI, but not decreased GDP. This would make the use of GDP more attractive for politicians in countries with increasing national debt and decreasing assets.