Which of the following is NOT required while considering GNP (Gross National Product)?

Gross National Product (GNP) is calculated using components of aggregate demand:
$$\text{GNP}=C+I+G+(X-M)+\text{NFIA}$$

Where:

* $C$ = Private Consumption
* $I$ = Private Investment
* $G$ = Government Purchases
* $(X-M)+\text{NFIA}$ = Net exports and net foreign factors/investments.

Per capita income is a derived average metric ($\frac{\text{National Income}}{\text{Total Population}}$) and is not a foundational expenditure component required to tally or measure GNP.