How is Gross National Product (GNP) derived from Gross Domestic Product (GDP), and why is Per Capita Income considered a superior indicator of economic welfare compared to aggregate GDP?

[ A ]GNP = GDP minus total domestic retail sales; aggregate GDP is always 100% accurate in measuring personal happiness.

[ B ]GNP is calculated by multiplying GDP by the repo rate; Per Capita Income ignores population size completely.

[ C ]GNP applies only to agricultural barter economies, whereas GDP measures foreign corporate debt.

[ D ]GNP = GDP + Net Factor Income from Abroad (NFIA); Per Capita Income measures average living standards by adjusting national income for population size, whereas aggregate GDP can rise while living standards fall if population grows faster.[ CORRECT ]

Takeaway

Option D is correct: GNP = GDP + Net Factor Income from Abroad (NFIA); Per Capita Income measures average living standards by adjusting national income for population size, whereas aggregate GDP can rise while living standards fall if population grows faster.

Derivation

GDP measures the market value of all final goods and services produced within a country's geographical borders. GNP measures the output produced by the country's permanent residents globally: GNP = GDP + Net Factor Income from Abroad (NFIA). Per Capita Income (National Income / Total Population) is a superior measure of economic welfare because it reflects the average income available per citizen; an economy's total GDP may increase, but if population expands at a faster rate, per capita income and living standards decline. This tests national income accounting. The common trap is treating aggregate GDP as living standards.

Why the others fail

A — GNP = GDP minus total domestic retail sales; aggregate GDP is always 100% accurate in measuring personal happiness.

GNP adjusts for net factor income from abroad, not retail sales deductions, and GDP does not directly measure individual happiness.

B — GNP is calculated by multiplying GDP by the repo rate; Per Capita Income ignores population size completely.

GNP has no mathematical relationship to central bank repo rates, and Per Capita Income explicitly divides national income by population.

C — GNP applies only to agricultural barter economies, whereas GDP measures foreign corporate debt.

GNP and GDP are foundational macroeconomic national accounting metrics applied across all modern developed and developing nations.