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# Population structure lesson4

Published on: Mar 4, 2016
Published in: Technology      News & Politics
Source: www.slideshare.net

#### Transcripts - Population structure lesson4

• 1. The interpretation of age / sex pyramids
• 2. POPULATION STRUCTURE: is the number of males and females in different age groups. The common method to show the structure is by a population pyramid. This diagram is made up by putting two bar graphs (one for male, one for female) side by side. From this you can read off what percentage of a population is of a certain gender and age range.
• 3. Key things to know about population pyramids: Population is divided into 5 year age groups. Horizontal line represents the percentage of male & female group The age groups are divided into 3 groups:  Young dependent (0-14 years old)  Working Population (15-64 years old)  Elderly Dependent (65+ years old) Population is divided into males and females. The percentage of each age /sex group is given.
• 4. What does the shape of thepopulation pyramids tell us? Information of birth and death rates Information of life expectancy People living in a particular country or place
• 5. Comparing LEDC & MEDC
• 6. Three general profiles of population pyramids: Rapid growth: indicated by a pyramid with large percentage of people in the younger ages Slow growth: reflected by a pyramid with a smaller proportion of the population of the younger ages. Zero population or decreasing populations: shown by roughly equal numbers of people in all age ranges, tapering off gradually at the older ages
• 7. The population pyramid forKenya: Typical of a country in the LEDCs experiencing rapid population growth Wide base -large numbers of dependent children aged 0-14 as a result of high fertility rates Top of the pyramid indicates smaller proportion of the population lives to old age.
• 8. Implication of this type of population structure(rapid growth): Limited resources will be stretched to meet the needs of the large number of dependent children for schooling, nutrition and health care. As this group reaches working age, a large number of jobs will be needed As this group reaches child bearing age, it is likely that fertility rates will be high leading to high rates of natural population increase
• 9. The population pyramid for the USA: Typical for MEDC experiencing slow rates of natural increase Narrow base reflects low birth rates Wider top of the pyramid is the result of people living longer The bulge in 30-40 age cohort is a result of the baby boom of the 1960s
• 10. The population pyramid forGermany: Is similar to that of USA It represents a zero- population growth (BR – DR = 0) People are distribute evenly throughout the cohorts
• 11. Implication of this type of population structure Ageing populationA smaller proportion of the working age and are faced with the task of generating enough wealth to provide high levels of support for the elderly population
• 12. Consequences of ageingpopulation Limited manpower for defense of a country Give pressure to government to provide more medical and health facility for ageing population Shortage of labour, most of elderly retire and not enough young people to replace them Need more housing facilities and transport to meet the need of ageing population
• 13. Advantages of ageing population Tourism sector is boosted by the elderly taking holidays during off-peak seasons Industriesthat tap into the pensioner market (e.g. wheel chairs) Some large properties have been converted to profitable residential homes
• 14. Dependency ratioDependency ratio = % of population aged 0-15 + % of population aged 65+ % 0f population of working age