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Gross Domestic Product (GDP) is the total market value of all final goods and services produced within a country during a given time period (usually a year or quarter). It is the central metric used by economists, governments, and central banks to evaluate an economy's size and health.

To measure GDP accurately without double-counting, macroeconomists use three equivalent approaches that view national output from different perspectives:

1. The Expenditure Approach (Final Sales):

This method sums all spending on final goods and services produced in the domestic economy. Intermediate goods (inputs used up in producing other goods, such as flour used in a bakery) are excluded to prevent counting the same value multiple times.

Formula: Output = Consumption + Investment + Government Spending + Net Exports (Y = C + I + G + NX).

2. The Value Added Approach (Production Method):

Value added is defined as the value of a firm's output minus the cost of the intermediate inputs it purchased from other firms. GDP equals the sum of value added across all firms in the economy.

Formula: Value Added = Revenue − Intermediate Input Costs.

3. The Income Approach:

Every dollar or krona spent on a final good ultimately becomes income for the factors of production—either as wages for workers, profits for business owners, or taxes for the government.

Formula: GDP = Total Wages + Total Capital Income (Profits) + Indirect Taxes.

Because every transaction has both a buyer and a seller, all three approaches yield the exact same GDP figure!

Let us walk through a concrete corporate example to see how value added and the three GDP approaches work in practice.

Example Scenario:

• Steel Company: Produces steel and sells it for 100 SEK to a Car Company. Pays 60 SEK in wages to its workers. Has zero intermediate input costs.
• Car Company: Buys steel for 100 SEK, produces finished cars, and sells them to consumers for 250 SEK. Pays 90 SEK in wages to its workers.

Let us compute GDP using all three methods:

1. Expenditure Approach:

We look only at final consumer sales. Steel sold to the car factory is an intermediate input. Cars sold to consumers for 250 SEK are final goods.

• Total GDP = 250 SEK

2. Value Added Approach:

• Steel Co. Value Added = Sales (100) − Inputs (0) = 100 SEK
• Car Co. Value Added = Sales (250) − Inputs (100) = 150 SEK
• Total GDP = 100 + 150 = 250 SEK

3. Income Approach:

• Steel Co. Profit = Sales (100) − Wages (60) = 40 SEK
• Car Co. Profit = Sales (250) − Steel Input (100) − Wages (90) = 60 SEK
• Total Wages = 60 + 90 = 150 SEK
• Total Profits = 40 + 60 = 100 SEK
• Total GDP = Total Wages (150) + Total Profits (100) = 250 SEK

When GDP increases from one year to the next, it can happen for two distinct reasons:

1. The economy produced more physical goods and services.

2. Prices of goods and services increased (inflation).

To separate physical production changes from price inflation, macroeconomists distinguish between:

• Nominal GDP: Measures total production valued at current market prices. If prices double while physical output stays unchanged, Nominal GDP doubles, even though no extra wealth was created!
• Real GDP: Measures total production valued at constant prices from a selected base year. Real GDP isolates changes in actual physical production volume.

Connecting Growth Rates:

Nominal GDP Growth ≈ Real GDP Growth + Inflation Rate.

Economic Growth and the Rule of 70:

To estimate how many years it takes for an economic variable (like real GDP) to double at a constant annual growth rate g (expressed in percentage), use the Rule of 70:

Doubling Time (years) ≈ 70 / g

• Example: If a country's real GDP grows at 3.5% per year, how long will it take for the economy to double in size?

Doubling Time ≈ 70 / 3.5 = 20 years.

To evaluate economic performance beyond GDP, macroeconomists track the labor market.

Key Labor Market Definitions:

• Working-Age Population (P): Total population aged 15–74.
• Labor Force (L): The sum of employed workers (N) and unemployed workers (U).

L = N + U.

• Unemployed (U): Individuals without a job who are actively seeking work and are available to start working immediately.
• Out of the Labor Force: Working-age individuals who do not have a job and are NOT actively seeking work (e.g., full-time students, retirees, discouraged workers).
• Unemployment Rate (u): The ratio of unemployed persons to the labor force:

u = U / L = U / (N + U).

The Discouraged Worker Effect:

If an unemployed worker loses hope and stops actively searching for work, they are reclassified from 'Unemployed' to 'Out of the Labor Force'. Because both U and L decrease, the calculated unemployment rate *drops*, even though no new jobs were created!

Okun's Law:

There is a strong empirical inverse relationship between Real GDP growth and changes in the unemployment rate, known as Okun's Law:

• When Real GDP growth is high (above potential growth), the unemployment rate falls.
• When Real GDP growth is low or negative (recession), the unemployment rate rises.