06/30/2026

 

Samuel Clifford

 

What is GDP?

 

GDP stands for Gross Domestic Product and is one of the most fundamental and studied parts of economics. Often, it is even used as the reference point for the health of an economy. Yet, even with such importance, GDP is widely misunderstood. GDP in its basic essence is the final value of all goods and services produced in a given time. GDP can be split into specific countries or states. It can even be split into cities or combined into world GDP. No matter how it is split or combined, a specific time period must be given to determine GDP. GDP can be determined quarterly, semi-yearly, yearly, etc.

 

How Do We Determine GDP?

 

The Expenditure Approach

 

This method totals the spending of all participants in the economy. It is the standard formula used by most economic organizations

 

The formula for this approach for GDP is as follows:

 

GDP=C+I+G+(X-M)

 

C stands for consumption. What does the population consume in terms of spending on goods and services?

 

I stands for investments. Business investments and capital spending like machinery, construction, and inventory’s

 

G stands for government. Government consumption and government investments like public infrastructure, defense, etc.

 

X-M stands for Net Exports. The total value of exports minus the total value of imports. Imports are subtracted so that GDP only counts products produced domestically.

 

The Income Approach:

 

Instead of tracking what people spend, this approach calculates the total income generated by producing those goods and services. Theoretically, it should yield the same result as the Expenditure Approach.

 

The formula for this approach for GDP is as follows:

 

GDP=National Income + Sales Tax + Depreciation + Net Foreign Factor Income

 

National Income: This is the sum of all wages, corporate profits, rent, and interest.

 

Sales Tax: Taxes imposed by the government on goods and services.

 

Depreciation: The loss in value of physical capital over time.

 

Net Foreign Factor Income: Income earned by domestic citizens abroad minus income earned by foreigners domestically.

 

Real v. Nominal GDP

 

Nominal GDP calculated GDP using current, present day prices. It does not account for inflation in prices. This means that under nominal GDP the GDP can go up simply because of inflation, not because more goods were made.

 

Real GDP does account for inflation. It measures production using prices from a fixed base year, allowing economists to accurately compare economic output over different time periods. 

 

Formula for Real GDP:

 

Real GDP = Nominal GDP/GDP Deflator x 100

 

GDP Deflator — Price index showing how much prices have changed relative to the base year.

 

The Bureau of Economic Analysis (BEA) publishes the GDP deflator directly, based on thousands of price measurements.

 

Problems with GDP:

 

-GDP cannot calculate with unrecorded production such as cash jobs, volunteering, and household production. 

 

-GDP excludes b2b (business to business) transactions as it is only impacted by final goods. Meaning supply chain transactions do not impact it.

 

GNP and GNI

 

Sometimes confused with GDP is GNP and GNI. GNP stands for Gross National Production. GNP measures all production completed by a nation's citizens, even if it is abroad. GDP, on the other hand, is limited by a nation's borders. GNI stands for Gross National Income. GNI does not focus on production but instead focuses on income earned by a country’s residents. 

 

GDP per Capita

 

GDP per capita is simply GDP divided by the population.

 

GDP per Capita = GDP/Total Population 

 

This measures the average economic output per person and is a rough indicator of standard of living. It is better than raw GDP when judging prosperity because raw GDP only tells you the size of an economy, not how well the average person is doing. A huge country can have massive GDP but low living standards because the output is spread across billions of people.