The Gross Domestic Product measures the value of economic activity within a country. Strictly defined, GDP is the sum of the market values, or prices, of all final goods and services produced in an economy during a period of time. There are, however, three important distinctions within this seemingly simple definition:
Now that we have an idea of what GDP is, let's go over how to compute it. We know that in an economy, GDP is the monetary value of all final goods and services produced. For example, let's say Country B only produces bananas and backrubs.
In the real world, the market values of many goods and services must be calculated to determine GDP. While the total output of GDP is important, the breakdown of this output into the large structures of the economy can often be just as important. In general, macroeconomists use a standard set of categories to breakdown an economy into its major constituent parts; in these instances, GDP is the sum of consumer spending, investment, government purchases, and net exports, as represented by the equation:
Y = C + I + G + NXBecause in this equation Y captures every segment of the national economy, Y represents both GDP and the national income. This because when money changes hands, it is expenditure for one party and income for the other, and Y, capturing all these values, thus represents the net of the entire economy.
Let's briefly examine each of the components of GDP.
GDP is just one way of measuring the total output of an economy. Gross National Product, or GNP, is another method. GDP, as said earlier, is the sum value of all goods and services produced within a country. GNP narrows this definition a bit: it is the sum value of all goods and services produced by permanent residents of a country regardless of their location. The important distinction between GDP and GNP rests on differences in counting production by foreigners in a country and by nationals outside of a country. For the GDP of a particular country, production by foreigners within that country is counted and production by nationals outside of that country is not counted. For GNP, production by foreigners within a particular country is not counted and production by nationals outside of that country is counted. Thus, while GDP is the value of goods and services produced within a country, GNP is the value of goods and services produced by citizens of a country.
For example, in Country B, represented in , bananas are produced by nationals and backrubs are produced by foreigners. Using figure 1, GDP for Country B in year 1 is (5 X $1) + (5 X $6) = $35. GNP for country B is (5 X $1) = $5, since the $30 from backrubs is added to the GNP of the foreigners' country of origin.
The distinction between GDP and GNP is theoretically important, but not often practically consequential. Since the majority of production within a country is by nationals within that country, GDP and GNP are usually very close together. In general, macroeconomists rely on GDP as the measure of a country's total output.
GDP is an excellent index with which to compare the economy at two points in time. That comparison can then be used formulate the growth rate of total output within a nation.
In order to calculate the GDP growth rate, subtract 1 from the value received by dividing the GDP for the first year by the GDP for the second year.
GDP growth rate = [(GDP1)/(GDP2] - 1For example, using , in year 1 Country B produced 5 bananas worth $1 each and 5 backrubs worth $6 each. In year 2 Country B produced 10 bananas worth $1 each and 7 backrubs worth $6 each. In this case the GDP growth rate from year 1 to year 2 would be:
[(10 X $1) + (7 X $6)] / [(5 X $1) + (5 X $6)] - 1 = 49%
There is an obvious problem with this method of computing growth in total output: both increases in the price of goods produced and increases in the quantity of goods produced lead to increases in GDP. From the GDP growth rate it is therefore difficult to determine if it is the amount of output that is changing or if it is the price of output undergoing change.
This limitation means that an increase in GDP does not necessarily imply that an economy is growing. If, for example, Country B produced in one year 5 bananas each worth $1 and 5 backrubs each worth $6, then the GDP would be $35. If in the next year the price of bananas jumps to $2 and the quantities produced remain the same, then the GDP of Country B would be $40. While the market value of the goods and services produced by Country B increased, the amount of goods and services produced did not. This problem can make comparison of GDP from one year to the next difficult as changes in GDP are not necessarily due to economic growth.
In order to deal with the ambiguity inherent in the growth rate of GDP, macroeconomists have created two different types of GDP, nominal GDP and real GDP.
The first step to calculating real GDP is choosing a base year. For example, to calculate the real GDP for in year 3 using year 1 as the base year, use the GDP equation with year 3 quantities and year 1 prices. In this case, real GDP is (10 X $1) + (9 X $6) = $64. For comparison, the nominal GDP in year 3 is (10 X $2) + (9 X $6) = $74. Because the price of bananas increased from year 1 to year 3, the nominal GDP increased more than the real GDP over this time period.
When comparing GDP between years, nominal GDP and real GDP capture different elements of the change. Nominal GDP captures both changes in quantity and changes in prices. Real GDP, on the other hand, captures only changes in quantity and is insensitive to the price level. Because of this difference, after computing nominal GDP and real GDP a third useful statistic can be computed. The GDP deflator is the ratio of nominal GDP to real GDP for a given year minus 1. In effect, the GDP deflator illustrates how much of the change in the GDP from a base year is reliant on changes in the price level.
For example, let's calculate, using , the GDP deflator for Country B in year 3, using year 1 as the base year. In order to find the GDP deflator, we first must determine both nominal GDP and real GDP in year 3.
Nominal GDP in year 3 = (10 X $2) + (9 X $6) = $74This means that the price level rose 16% from year 1, the base year, to year 3, the comparison year.
Real GDP in year 3 (with year 1 as base year) = (10 X $1) + (9 X $6) = $64
The ratio of nominal GDP to real GDP is ( $74 / $64 ) - 1 = 16%.
Rearranging the terms in the equation for the GDP deflator allows for the calculation of nominal GDP by multiplying real GDP and the GDP deflator. This equation demonstrates the unique information shown by each of these measures of output. Real GDP captures changes in quantities. The GDP deflator captures changes in the price level. Nominal GDP captures both changes in prices and changes in quantities. By using nominal GDP, real GDP, and the GDP deflator you can look at a change in GDP and break it down into its component change in price level and change in quantities produced.
GDP is the single most useful number when describing the size and growth of a country's economy. An important thing to consider, though, is how GDP is connected with standard of living. After all, to the citizens of a country, the economy itself is less important than the standard of living that it provides.
GDP per capita, the GDP divided by the size of the population, gives the amount of GDP that each individual gets, on average, and thereby provides an excellent measure of standard of living within an economy. Because GDP is equal to national income, the value of GDP per capita is therefore the income of a representative individual. This number is connected directly to standard of living. In general, the higher GDP per capita in a country, the higher the standard of living.
GDP per capita is a more useful measure than GDP for determining standard of living because of differences in population across countries. If a country has a large GDP and a very large population, each person in the country may have a low income and thus may live in poor conditions. On the other hand, a country may have a moderate GDP but a very small population and thus a high individual income. Using the GDP per capita measure to compare standard of living across countries avoids the problem of division of GDP among the inhabitants of a country.