Gross National Product (GNP) and Gross Domestic Product (GDP) are related, but their sum cannot be zero.
Key Difference:
\[
\text{GNP} = \text{GDP} + \text{Net Factor Income from Abroad (NFIA)}
\]
- If NFIA is positive, GNP will be greater than GDP.
- If NFIA is negative, GNP will be less than GDP.
- If NFIA is zero, GNP will be equal to GDP.
Thus, option (D) is incorrect, as the sum of GDP and GNP is not necessarily zero but depends on NFIA.