Chapter Overview

National income (राष्ट्रीय आय) is the starting point of the Economy syllabus. Every later chapter, from planning and budgets to poverty and the external sector, uses the same vocabulary: GDP, GNP, NNP, GVA, factor cost, base year, real growth, per capita income. This chapter builds that vocabulary, shows how India’s National Statistics Office measures it, and explains which sectors produce India’s and Chhattisgarh’s output.

What You’ll Learn

By the end of this chapter, you will be able to:

Define GDP, GNP (GNI), NDP and NNP and move between them using NFIA, depreciation and net indirect taxes
Explain market price, basic price and factor cost, and why India reports GVA at basic prices
Distinguish nominal and real GDP and use the GDP deflator
Describe the product, income and expenditure methods and what is included or excluded
Recall the history of estimation in India (Naoroji → V.K.R.V. Rao → Mahalanobis Committee → CSO → NSO) and the 2022–23 base-year revision
Classify activities into primary, secondary and tertiary sectors and explain India’s services-led structure
Analyse Chhattisgarh’s GSDP: an industry-heavy output mix with a farm- and forest-dependent workforce

Prerequisites

No earlier Economy chapter is needed. Comfort with percentages helps: Basic Numeracy.

Learning Path

Follow the topics in this order:

graph TD
    A["1. GDP, GNP and NNP
aggregates, factor cost,
basic prices, deflator"] --> B["2. Measuring National Income
three methods, NSO,
base year 2022-23"]
    B --> C["3. Sectors of the Economy
primary, secondary, tertiary;
India vs Chhattisgarh"]
    C --> D["4. Quick Revision
One-page sheet"]
    D --> E["Next chapter:
Economic Planning and NITI Aayog"]

Topics in This Chapter

#	Topic	What it covers
1	GDP, GNP and NNP	Final goods and value added, GDP vs GNP (NFIA), gross vs net, market price vs basic price vs factor cost, national income, PDI, nominal vs real GDP, GDP deflator, GDP and welfare
2	Measurement of National Income	Circular flow; product, income and expenditure methods; inclusions and exclusions; NSO and the release cycle; history of estimation; 2022–23 base year; Chhattisgarh GSDP
3	Sectors of the Economy	Primary, secondary, tertiary (and quaternary); MoSPI groupings; output vs employment shares; Chhattisgarh’s sector mix; organised vs unorganised; public vs private; structural transformation
—	Quick Revision	Formulas, dates, numbers and traps on one page

Where It Is Asked

Paper	What to expect
Prelims P-I (Part 1, India GS)	Definitions and relationships (GNP = GDP + NFIA, NNP at FC = national income), “which is included in national income”, product vs production taxes, sector of an activity, history of estimation (Naoroji, Rao, Mahalanobis), base year. Statement-based and match-the-following formats are common
Mains P-V (GS-III), Economy section	Short answers (GDP vs GNP, value added method, organised vs unorganised) and analytical answers (GDP vs welfare, base-year revision, structural transformation, Chhattisgarh’s economy)

Exam focus

High-yield: the “three switches” from GDP at MP to NNP at FC; GVA at basic prices (since 2015); the 2022–23 base year (27 February 2026); transfer payments excluded; mining = primary sector.
Common mistakes: assuming GNP > GDP for India; counting remittances or pensions in national income; calling construction a service; calling agriculture Chhattisgarh’s largest sector by output.
Chhattisgarh angle for Mains: GSDP and per capita income from the state’s Economic Survey (with year and estimate type); the gap between industry’s share of GSDP and agriculture’s share of jobs; minor forest produce and mining in the state’s accounts.

Quick Reference: Aggregates at a Glance

Aggregate	Formula / meaning
GDP at MP	Final goods and services produced within the domestic territory in a year
GNP (GNI)	GDP + NFIA
NDP	GDP − depreciation
NNP	GNP − depreciation
National income	NNP at factor cost = NNP at MP − net indirect taxes
GVA at basic prices	GVA at factor cost + net production taxes
GDP at MP (from GVA)	GVA at basic prices + net product taxes
GDP deflator	Nominal GDP ÷ real GDP × 100
Expenditure identity	GDP = C + I + G + (X − M)
Income method	Compensation of employees + operating surplus + mixed income = NDP at FC
Base year (as of 2026)	2022–23, replacing 2011–12

Start Learning

Begin with the first topic:

→ GDP, GNP and NNP