That local economic production and consumption contribute to Gross Domestic Product (GDP) is a definitional truism of national accounting, as GDP measures the total monetary value of all goods and services produced and consumed within an economy.
The claim states that products produced and consumed locally contribute to the value of GDP. By definition, Gross Domestic Product measures the value of goods and services produced within a country's borders, making local production and consumption a fundamental component of GDP. Therefore, this claim is common knowledge and requires no citation of empirical papers.