Session 5 Economic Indicator 1: Gross Domestic Product (GDP)
What GDP Measures
Gross Domestic Product (GDP) measures the total value of all goods and services produced within an economy over a specific period. It is one of the most widely used indicators of economic health.
📈 Positive GDP
• Economic expansion
• Rising business activity
• Stronger employment
• Higher consumer spending
📉Negative GDP
• Economic slowdown
• Falling output
• Weaker demand
• Higher recession risk
The GDP growth rate compares changes in economic output on a quarterly or annual basis, showing how fast an economy is growing or shrinking.
How GDP Is Calculated
1. Expenditure (Spending) Approach
GDP = C + I + G + (X − M)
🛒 Consumption (C) ~65–70%
🏗️ Investment (I) ~15–20%
🏛️ Government (G) ~15–20%
🌍 Net Exports (X − M) Varies
C – Consumption: Household spending on goods and services (e.g., food, rent, healthcare).
This is the largest component, accounting for over two-thirds of GDP in many developed economies.
I – Investment: Business spending on capital goods such as machinery, buildings, and equipment.
G – Government Spending: Public sector expenditure on infrastructure, services, and wages.
X − M – Net Exports: Exports minus imports.
This approach highlights demand-driven growth, making it particularly useful for investors.
2. Production (Output) Approach
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Value of all final goods & services− Cost of intermediate inputs
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The production approach measures the total value of output produced by all industries in the economy and subtracts the value of intermediate goods used in production.
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It focuses on value added at each stage of production
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It works backward from completed goods and services
3. Income Approach
The income approach measures GDP by adding up all the income earned in an economy.
If someone earns money from producing goods or services, it counts toward GDP.
This includes income paid to:
👩🏭Workers → wages and salaries
🏢Businesses → company profits
🏠Property owners → rent from land and buildings
💵Lenders and investors → interest on loans and capital
To get the full picture, two adjustments are added:
Indirect business taxes (such as sales and property taxes), which are part of the final price of goods and services
Depreciation, which accounts for the wear and tear on machines, buildings, and equipment used in production
When all of these are combined, they represent the total income generated by the economy, which equals GDP under the income approach.
Types of GDP
1. Nominal GDP:
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Measures output at current market prices without adjusting for inflation. Useful for identifying short-term growth trends.
2. Real GDP:
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Adjusts for inflation and uses constant prices. This is the preferred measure for long-term economic analysis.
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Real GDP = Nominal GDP − Inflation
3. GDP Per Capita:
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GDP divided by population. Commonly used to estimate average living standards.
4.GDP Growth Rate:
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Expressed as a percentage change over time and closely watched by policymakers and investors.
5. Purchasing Power Parity (PPP):
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Adjusts GDP for differences in cost of living across countries, allowing for more accurate international comparisons.
Trade Balance and GDP
The foreign balance of trade plays a crucial role in GDP:
📈 Trade Surplus
Exports > Imports
→ Net Exports Positive
→ GDP Increases
📉 Trade Deficit
Imports > Exports
→ Net Exports Negative
→ GDP Decreases
Net exports reflect how competitive a country’s producers are globally and can significantly influence overall growth.
Consumer Confidence and GDP
Consumer spending is the largest driver of GDP, making consumer confidence a key factor:
High confidence → increased spending → higher GDP
Low confidence → reduced spending → slower growth
Because consumption dominates GDP, shifts in consumer sentiment often lead changes in economic growth.
Why Higher GDP Supports Stock Prices
Economic growth tends to support equity markets through a clear chain reaction:
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Higher economic output leads to higher company revenues
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Higher revenues result in stronger corporate profits
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Stronger profits support higher dividends and stock valuations
Over the long term, corporate earnings tend to track GDP growth. This is why stock markets generally rise as economies expand.
Corporate Earnings and GDP
Stock prices are ultimately based on expectations of future earnings. Because company profits depend heavily on overall economic activity, GDP growth directly influences how investors value stocks.
Expanding GDP typically boosts demand across sectors such as consumer goods, manufacturing, technology, and financial services. Conversely, slowing or negative GDP growth can reduce sales, compress margins, and lower earnings expectations.
Why the GDP–Stock Market Relationship Isn’t Perfect
1. Forward-Looking Markets vs. Backward-Looking GDP
Stock markets are forward-looking. Prices reflect investors’ expectations about future corporate earnings, economic growth, and monetary policy, not just what has already happened. Investors often buy or sell based on forecasts, projections, and signals about the quarters ahead.
GDP, by contrast, is backward-looking. It measures the total economic output that has already occurred, usually on a quarterly basis, and is highly aggregated across all sectors of the economy. Because it is reported after the fact and often revised later, it lags behind current market conditions.
This difference creates a timing mismatch:
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Markets may rise before GDP data confirms growth because investors anticipate stronger earnings ahead.
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Markets may fall before GDP shows a slowdown because investors are reacting to expected weakness or policy changes.
2. Global Revenues Reduce the Link to Domestic GDP
Many publicly traded companies—particularly large multinational firms—earn a substantial portion of their revenues outside their home country. This means domestic GDP growth does not always accurately reflect a company’s earnings potential.
For example:
A country’s GDP may slow while global demand remains strong
Companies with significant international exposure may continue growing profits despite weak domestic conditions
This globalisation further weakens the direct relationship between national GDP and stock market performance.
3. GDP, Inflation, and Interest Rates
At first glance, strong GDP growth seems like an unqualified positive: higher output, higher corporate profits, and rising employment. But rapid economic expansion can also create inflationary pressures, which may lead central banks to tighten monetary policy—raising interest rates—which in turn can slow certain parts of the economy and affect stock prices.
How GDP Growth Can Lead to Inflation
A. Stronger Consumer and Business Demand
When GDP grows quickly, consumers and businesses are spending and investing more.
High demand for goods and services can push prices upward, because sellers can charge more when buyers compete for limited resources.
Example: More people buying homes drives up housing prices.
B.Capacity Constraints
Every economy has a finite ability to produce goods and services at a given moment.
Factories, logistics, and labor can only expand output so fast. When GDP grows rapidly, production may approach or exceed these limits.
Firms cannot immediately hire more workers, expand factories, or secure raw materials, so bottlenecks appear, slowing the ability to meet rising demand.
This “supply-side pressure” is often driven by businesses themselves, as they cannot hire or produce fast enough to meet demand, and by consumer demand that exceeds what the economy can supply.
Why this happens:
Rapid GDP growth signals that the economy is consuming more than usual, pushing businesses to operate near maximum capacity.
Consumers’ rising demand can outpace what businesses can supply in the short term.
Example: A car manufacturer may receive more orders than it can fulfill because it cannot hire workers or source parts quickly enough.
C. Supply Shortages
Even if businesses want to expand, certain sectors may face limits due to:
Raw material constraints (e.g., metals, semiconductors)
Labor shortages (not enough skilled workers)
Global supply chain disruptions (delays from imports or logistics bottlenecks)
These shortages can amplify inflation, pushing prices higher even if GDP growth is concentrated in other areas.
Example: A sudden spike in semiconductor demand can raise electronics prices, regardless of overall GDP growth.
Inflation Prompts Central Banks to Act
Rising inflation threatens the economy by eroding purchasing power—the same amount of money buys fewer goods and services. If inflation rises too quickly, it can overheat the economy, making it unsustainable for consumers and businesses. To prevent runaway inflation and slow GDP growth to a more stable pace, central banks often raise interest rates.
Higher interest rates affect the economy and markets in several ways:
Businesses: Borrowing costs rise, reducing investment and slowing expansion.
Consumers: Loans for homes, cars, and credit become more expensive, lowering spending.
Investors: The present value of future earnings declines, putting downward pressure on stock valuations.
Example:Strong GDP growth → Higher demand and production limits → Prices go up (inflation) → Central bank raises interest rates → Loans and borrowing cost more → People and businesses spend less → Stock prices fall (especially for industries that depend on spending) → Sectors like healthcare and utilities hold up better