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Lesson M13.L01: National Accounts Revisited: GNI, NNI, and Sectoral Balances

Module: National Accounting, Keynesian Income-Expenditure Model and Fiscal Policy Level: intermediate Duration: 30 minutes Learning Objective: Reconcile GDP, GNI, and NNI using the national accounts framework. Data as of: 2024 Provenance: ABS National Accounts | OpenStax Macro 3e

Explanation

Three related aggregate income measures — GDP, GNI, and NNI — are linked by two adjustments that capture where income is earned versus who earns it, and how much capital depreciates.

GDP (Gross Domestic Product) measures the market value of all final goods and services produced within a country's borders in a given period, regardless of the nationality of the producers.

GNI (Gross National Income) adjusts GDP for net factor income from abroad (NFIA):

GNI = GDP + NFIA

where NFIA = factor income received from abroad − factor income paid to foreign residents. For Australia, NFIA is typically slightly negative because Australia is a net debtor nation: interest, dividends, and profits paid to foreign investors exceed receipts from Australian-owned foreign assets. In 2023–24, Australia's GNI was approximately 1–2% below GDP.

NNI (Net National Income) subtracts the consumption of fixed capital (CFC), commonly called depreciation (δ):

NNI = GNI − CFC

CFC accounts for the wearing out of the capital stock during production. Because GDP is a gross measure, it includes the output needed merely to replace depreciated capital — NNI strips this out to reveal net additions to national income.

Sectoral Balances Identity. The economy comprises three sectors: private (households + firms), government, and external (rest of world). Their financial balances must sum to zero:

(S − I) + (T − G) + (M − X) = 0

where S = private saving, I = private investment, T = net taxes, G = government spending, M = imports, X = exports. Rearranging: a government deficit (T − G < 0) must be matched by private saving surplus and/or current account deficit. This is a pure accounting identity, not a behavioural claim.

In Australia, the government sector ran persistent deficits for most of the 2010s, matched by a combination of private saving surpluses and current account deficits, consistent with the identity.

Worked Example

Given data (stylised, based on ABS 5206.0, 2023–24):

Item AUD billion
GDP 2,700
Factor income received from abroad 80
Factor income paid abroad 120
Consumption of fixed capital (CFC) 400

Step 1 — Calculate NFIA:

NFIA = income received − income paid = 80 − 120 = −$40bn

Step 2 — Calculate GNI:

GNI = GDP + NFIA = 2,700 + (−40) = $2,660bn

Step 3 — Calculate NNI:

NNI = GNI − CFC = 2,660 − 400 = $2,260bn

Step 4 — Verify sectoral balances. Suppose private saving S = $560bn, private investment I = \(480bn, government balance (T − G) = −\)30bn. Then:

(S − I) + (T − G) + (M − X) = 0 (560 − 480) + (−30) + (M − X) = 0 80 − 30 + (M − X) = 0 M − X = −50 → current account surplus of $50bn

Common Misconception

Misconception: GNI and GDP are interchangeable because they "measure the same thing."

Correction: GDP is a location-based measure (production within borders); GNI is a residence-based measure (income accruing to residents). For small open economies with significant foreign ownership of domestic capital (like Australia), the gap between them — net factor income from abroad — is economically meaningful and typically negative. Using GDP when GNI is appropriate can overstate Australian residents' income.

Practice Prompts

  1. What is the conceptual difference between a gross and a net national income measure, and why does this distinction matter for measuring a nation's economic wellbeing? → Answer: "Gross" includes the value of output needed to replace depreciated capital (CFC), while "net" subtracts CFC. GDP and GNI overstate the resources available for consumption and investment because some output is merely replacing worn-out capital. NNI is a better welfare measure since it reflects net additions to productive capacity and consumable income.

  2. Using the following data, calculate GNI and NNI. GDP = $3,000bn; factor income received from abroad = $90bn; factor income paid abroad = $150bn; consumption of fixed capital = $450bn. → Answer:

  3. NFIA = 90 − 150 = −$60bn
  4. GNI = 3,000 + (−60) = $2,940bn

  5. NNI = 2,940 − 450 = $2,490bn

  6. If Australia's government runs a budget deficit of $50bn and the private sector runs a financial surplus of $30bn, what does the sectoral balances identity imply for the current account? → Answer: Using (S − I) + (T − G) + (M − X) = 0: private surplus = +30, government balance = −50. Therefore (M − X) = 50 − 30 = +20, implying a current account deficit of $20bn. A government deficit not fully offset by private saving must be financed by foreign borrowing (current account deficit).

Further Resources