Answer: The correct answer is b: because their value is included in that of the final product.
Step-by-step explanation:
Intermediate products, also known as intermediate goods, are goods that are used as inputs in the production process to create final goods or services. These intermediate products do not directly contribute to the final output that is purchased by consumers.
To avoid double-counting the value of these intermediate products, they are excluded from macroeconomic calculations of GDP (Gross Domestic Product). Including their value would lead to an overestimation of the total output of an economy. By including only the value of final products, GDP accurately represents the market value of goods and services produced for consumption or investment.