National Income Accounting and Identities
Quantify aggregate economic activity using the expenditure and income approaches.
Part 1/3 — Advanced Theory & Mechanics
This technical whitepaper examines the structural architecture of National Income Accounting (NIA), focusing on the formalization of the System of National Accounts (SNA 2008) framework maintained by the United Nations, IMF, and OECD. The core objective is to deconstruct the Gross Domestic Product (GDP) identity into its constituent exogenous and endogenous variables, examining the flow of funds through the prism of the Fundamental Identity: Output (Y) ≡ Expenditure (E) ≡ Income (I). By analyzing the friction between the Production Approach, the Expenditure Approach, and the Income Approach, this section provides the mathematical baseline for modeling macroeconomic stability, inflationary gaps, and the velocity of capital within a closed or open economy.