17.1 - Uses of National Income Data
Calculating GDP per capita and its link to living standards
Gross domestic product (GDP) measures a country's total economic output. When divided by the population, it provides GDP per capita, which offers insight into average economic well-being.
Formula for GDP per capita
Where:
- Total GDP = Overall value of goods and services produced in a country (£)
- Population size = Total number of people in the country
In general, a higher GDP per capita points to a better standard of living, as it suggests more economic resources per person.
Worked example - Calculating GDP per capita
A country has a total GDP of £3,200 billion and a population of 72 million. Calculate the GDP per capita.
Step 1: Identify the values
- Total GDP = £3,200 billion
- Population size = 72 million
Step 2: Apply the formula
Gross national income and gross national product
Beyond GDP, economists use other measures like gross national income (GNI) and gross national product (GNP) to assess economic performance and living standards.
Gross national income
GNI includes GDP plus net income from abroad. This net figure accounts for earnings from foreign investments owned by the country's residents, minus income earned by foreigners from domestic investments.
Gross national product
GNP focuses on the total output produced by a country's citizens, regardless of whether they live in the country or abroad.
Calculating GNI and GNP per capita
Both GNI and GNP per capita are found by dividing the total GNI or GNP by the population size, similar to GDP per capita. These metrics help compare living standards across nations, often providing a broader view than GDP alone by including international income flows.
Purchasing power parity for international comparisons
When comparing living standards between countries with different currencies, direct exchange rates may not accurately reflect true value due to varying costs of living.
The concept of purchasing power parity
Purchasing power parity (PPP) adjusts for differences in what a unit of currency can buy in various countries. For example, £1 might purchase more goods in a less developed economy than in a more developed one.
Applying PPP in comparisons
To use PPP, GDP per capita figures are adjusted to account for these purchasing power differences, with results typically shown in US dollars. This method enables more reliable and straightforward comparisons of economic output and living standards.
Uses of GDP and GDP per capita
GDP and GDP per capita serve as key indicators for evaluating economic health and quality of life across countries.
Indicators of economic performance and living standards:
- High GDP - Indicates strong overall economic performance, showing robust production of goods and services.
- High GDP per capita - Suggests elevated living standards, as it implies greater average income and resources available per person.
These measures help policymakers and analysts gauge progress and make international benchmarks.
Limitations of GDP and related measures
While GDP, GNI, GNP, and their per capita versions are useful, they have drawbacks when used for comparisons.
Key limitations in comparisons:
- Hidden economy - Unofficial or unreported economic activities, such as informal work, are often excluded from official figures, distorting the true picture.
- Public spending variations - Countries differ in government provisions like unemployment benefits or free healthcare, affecting actual living standards beyond what GDP shows.
- Income inequality - Similar GDP per capita values can mask vast differences in wealth distribution between rich and poor within countries.
- Other living standard factors - These include variations in working hours, employment conditions, environmental quality, and specific needs like higher heating costs in colder climates, which GDP does not fully capture.