- Composition by sector > Services: The gross domestic product (GDP) or value of all final services produced within a nation in a given year. GDP dollar estimates in the Factbook are derived from purchasing power parity (PPP) calculations. See the CIA World Factbook for more information.
- Composition, by sector of origin > Services: This entry is derived from Economy > GDP > Composition, by sector of origin, which shows where production takes place in an economy. The distribution gives the percentage contribution of agriculture, industry, and services to total GDP, and will total 100 percent of GDP if the data are complete. Agriculture includes farming, fishing, and forestry. Industry includes mining, manufacturing, energy production, and construction. Services cover government activities, communications, transportation, finance, and all other private economic activities that do not produce material goods.
- Per capita > PPP: This entry shows GDP on a purchasing power parity basis divided by population as of 1 July for the same year.
- Purchasing power parity: This entry gives the gross domestic product (GDP) or value of all final goods and services produced within a nation in a given year. A nation's GDP at purchasing power parity (PPP) exchange rates is the sum value of all goods and services produced in the country valued at prices prevailing in the United States. This is the measure most economists prefer when looking at per-capita welfare and when comparing living conditions or use of resources across countries. The measure is difficult to compute, as a US dollar value has to be assigned to all goods and services in the country regardless of whether these goods and services have a direct equivalent in the United States (for example, the value of an ox-cart or non-US military equipment); as a result, PPP estimates for some countries are based on a small and sometimes different set of goods and services. In addition, many countries do not formally participate in the World Bank's PPP project that calculates these measures, so the resulting GDP estimates for these countries may lack precision. For many developing countries, PPP-based GDP measures are multiples of the official exchange rate (OER) measure. The difference between the OER- and PPP-denominated GDP values for most of the weathly industrialized countries are generally much smaller.
"Western Sahara GDP Stats", NationMaster. Retrieved from http://www.nationmaster.com/country-info/profiles/Western-Sahara/Economy/GDP
"Western Sahara GDP Stats, NationMaster." 2007. <http://www.nationmaster.com/country-info/profiles/Western-Sahara/Economy/GDP>.
'Western Sahara GDP Stats, NationMaster', <http://www.nationmaster.com/country-info/profiles/Western-Sahara/Economy/GDP> [assessed 2007]
"Western Sahara GDP Stats", NationMaster [Internet]. 2007. Avaliable from: <http://www.nationmaster.com/country-info/profiles/Western-Sahara/Economy/GDP>.
"Western Sahara GDP Stats", NationMaster. Avaliable at: nationmaster.com. Assessed 2007.
"Western Sahara GDP Stats, NationMaster," http://www.nationmaster.com/country-info/profiles/Western-Sahara/Economy/GDP (assessed 2007)
"Western Sahara GDP Stats", NationMaster, http://www.nationmaster.com/country-info/profiles/Western-Sahara/Economy/GDP (last visited 2007)
"Western Sahara GDP Stats", NationMaster, http://www.nationmaster.com/country-info/profiles/Western-Sahara/Economy/GDP (as of 2007)