Barcelona Field Studies Centre

Population Structure

Population structure can be shown as a population pyramid, see diagram below:

U.K. Population Pyramid 1994

Features of a population pyramid.

  • Population is divided into 5 year age groups.
  • Population is divided into males and females.
  • The percentage of each age /sex group is given.

Typical pyramids

Typical Pyramids





MEDC/LEDC Occupational Structures
  Primary Secondary Tertiary
MEDC Very low. Machines have largely replaced human labour on the farms. Low. Automation is increasingly replacing human labour in factories. Globalisation is leading to a shift of manufacturing jobs to the NICs. High. Large numbers are employed in education, health, administration and the knowledge economy
LEDC Large primary sector (farming). Exports are usually primary commodities. Low. Tariff barriers imposed by the trading blocs such as the EU prevent the export of cheap manufactured products. The domestic market is very small. Large service sector. Many employed in the informal economy.
NIC Shrinking primary (farming) sector. Secondary sector is large and growing (transnationals). Small but growing tertiary sector to serve the needs of the transnationals