NISM-Series-XV: Research Analyst · Economic Analysis

Economic Growth Models and Sector Linkages for Research Analysts

Updated 11 October 2026 · Fact-checked

Economic growth models explain what drives output: labour, capital, productivity, savings and investment. Sector linkages show how a macro forecast flows into industry demand and then company earnings. This is the top-down approach: economy first, then industry, then company. In the exam, trace the chain step by step.

Understand Economic Growth Models and Sector Linkages

Economic growth means a rise in the output of goods and services over time. It is usually measured by the growth in real GDP. Real GDP strips out price changes, so it shows actual volume growth.

Growth models break output into inputs. The main drivers are labour (size and skills of the workforce), capital (machinery, infrastructure, factories) and productivity (how much output you get from each unit of input, often driven by technology and better organisation). Faster growth needs more inputs, better use of inputs, or both.

Capital comes from savings. Households, companies and the government save. Banks and capital markets channel these savings into investment. Higher savings can fund higher investment, and higher investment adds to capacity and future growth. If domestic savings fall short of investment needs, the gap is filled by foreign capital, which shows up as a current account deficit. Efficiency matters too: investment only lifts growth if it is put to productive use.

The top-down approach starts with the economy. You forecast GDP growth, inflation, interest rates and the exchange rate. Then you ask which industries benefit or suffer from that outlook. Finally you pick companies within the favoured industries. The opposite is bottom-up, which starts with company analysis and gives less weight to the macro view.

Sector linkages are the bridge. Interest-rate-sensitive sectors such as banks, housing and autos react to rate changes. Export sectors such as IT react to the exchange rate and global growth. Consumer staples are steadier through the cycle. A macro forecast changes industry demand, which changes company revenue, margins and earnings, which feed into valuation.

Key formulas to remember

Real GDP growth (approx.): Real growth ≈ Nominal growth − Inflation; Approximation for exam use. Real GDP is measured at constant prices.
Growth accounting idea: Output growth ≈ contribution of labour + contribution of capital + productivity growth; Productivity growth is the part not explained by more labour or capital.
Savings-investment identity (open economy): Investment = Domestic savings + Foreign savings (net capital inflow); Foreign savings equals the current account deficit. If savings exceed investment, the country has a current account surplus.
Top-down sequence: Economy → Industry → Company; Bottom-up is the reverse: Company → Industry → Economy.

How to solve Economic Growth Models and Sector Linkages questions

Use this method for any question on growth drivers, savings and investment, or the top-down approach.

1Identify what is asked: a growth driver, a savings-investment relationship, or a macro-to-company link.
2Place the question in the chain: economy, industry or company level.
3Name the macro variable that changes: GDP growth, interest rates, inflation, exchange rate or savings rate.
4Decide which industries are sensitive to that variable and in which direction.
5Trace the effect to company revenue, costs and earnings.
6Check each option for reversed direction, wrong level or an absolute word like 'always'.
7Pick the option that follows the logical chain and matches the standard definition.

Quickest way: Chain-and-direction check

When to use it: Use when a question gives a macro change and asks about an industry or company outcome.

Write the macro change in one word: up or down.
Ask who gains and who loses: borrowers, exporters, importers, consumers.
Rule out options with the opposite direction.
Between the rest, prefer the one that follows economy → industry → company.
Skip and return if two options still look right.

Common mistakes in Economic Growth Models and Sector Linkages

Confusing top-down with bottom-up.
Both names sound similar and students reverse the order.
Fix: Top-down starts at the economy and ends at the company. Bottom-up starts at the company.
Treating nominal GDP growth as real growth.
Headline numbers often mix price rises with output rises.
Fix: Real growth removes inflation. Nominal growth includes it.
Assuming higher savings always means higher growth.
Students stop at the first link in the chain.
Fix: Savings help only if channelled into productive investment. Efficiency of use matters.
Ignoring productivity as a growth driver.
Students remember only labour and capital.
Fix: List three drivers: labour, capital and productivity or technology.
Assuming all sectors move the same way with GDP.
Students overlook differing sensitivity.
Fix: Cyclical sectors swing with the economy. Defensive sectors such as staples are steadier.
Saying the macro view alone decides which stock to buy.
Top-down is mistaken for the full analysis.
Fix: Macro and industry views narrow the field. Company analysis and valuation still decide the final choice.

Worked examples

Example 1

Nominal GDP grows by 11% and inflation (the GDP deflator) is 4%. Using the approximation, what is real GDP growth?

Show the solution

Real growth ≈ Nominal growth − Inflation.
Real growth ≈ 11% − 4%.
Real growth ≈ 7%.

Answer: About 7%. The remaining 4% is a price effect, not extra output.

Example 2

An analyst using the top-down approach expects a sharp fall in interest rates. Which sequence best describes her next steps?

Show the solution

Top-down starts with the economy, so the rate forecast is the first step.
Next, identify rate-sensitive industries such as housing finance, banks and autos, where lower rates cut borrowing costs and lift demand.
Then assess companies within those industries for revenue, margin and earnings effects.
Finally, value the shortlisted companies and compare with market prices.

Answer: Economy (rate forecast) → rate-sensitive industries → companies in those industries → valuation. Starting with a single company would be bottom-up.

Exam tips

Expect direct questions on the order of the top-down approach. Memorise economy → industry → company.
Know the three growth drivers: labour, capital and productivity.
For savings and investment, remember that a gap is funded by foreign capital and appears as a current account deficit.
Read for words like 'always' and 'only'. Sector sensitivity to the macro view is rarely absolute.
With negative marking, skip a question you cannot trace in a chain rather than guess blindly.

Practice questions from Economic Analysis

Economic Growth Models and Sector Linkages: frequently asked questions

What is the top-down approach in equity research?

It starts with the economy, then moves to industries, then to individual companies. Macro forecasts guide which sectors look attractive. Company analysis then picks specific stocks.

What drives economic growth?

The main drivers are labour, capital and productivity. Savings fund capital formation, and investment turns savings into capacity. Better technology and efficiency raise output from the same inputs.

How are savings and investment linked?

Savings supply the funds that finance investment. If domestic savings are lower than investment, the gap is met by foreign capital, shown as a current account deficit.

How do I link a macro forecast to company earnings?

Trace the change through industry demand to company revenue, then costs and margins, then earnings. Check the company's sensitivity to the variable, such as interest rates or the exchange rate.