Population Structure

Category: Education

Presentation Description

Includes population pyramids


Presentation Transcript

Population Structure:

The structure or composition of a population is the product of the process of fertility, mortality and migration. Population Structure

Population structure:

Population structure The most studied aspects of population structure are age and sex. Age and sex structure is illustrated by the use of population pyramids.

PowerPoint Presentation:

Absolute data- shows figures in thousands or millions . Relative data– shows the numbers involve in percentages. Each bar represents a five year age – group apart from the uppermost bar which usually illustrates the population 85 years old and over. The male population is represented to the left of the vertical axis with females top the right.

The dependency ratio:

The dependency ratio Is the relationship between the working or economically active population and non-working population. The dependency ratio % pop aged 0-14 + % pop aged 65+ = % pop 15-64 The dependency ratio for MEDC’s is usually between 50 and 75. LEDC’S typically have ratios between 85 and 105.

PowerPoint Presentation:

Youth dependency ratio is the ratio of the number of people under 15 to those 15-64 years of age. The elderly dependency ratio is the ratio of the number of people over 64 years to those 15-64 years of age.

Features of population pyramid :

Features of population pyramid The youngest age group of 0-15 are dependants as they are usually of school age and depend on others for resources The 15-64 age group are usually working and young and elderly groups are dependent on them. They provide resources that the other groups depend on. The elderly group from 65 upwards are dependants as they are not usually in work.

Evidence of an ageing population in Norway:

Evidence of an ageing population in Norway Large number/ proportion of old dependents Lots of old people Wide top Increasing number/ proportion of old dependents/ decreasing number of young dependents More living to 95 + people living longer/ life expectancy increasing Less than 10,000 at 95 + in 2000 20,000 in 2025

Effects of ageing population in Norway:

Effects of ageing population in Norway Increases dependency ratio/strain on working population High taxation, more money for pensions to support elderly Need for more care homes/ health care/facilities for elderly Not enough workers for key position/ smaller workforce More non-economically active people/ difficult to defend country Need to attract foreign workers Services for young under utilized/uneconomical Economy slows down/ not so vibrant/ less innovative workforce/ increases retirement age/ creation of jobs for caring elderly.

Problems caused by over population:

Problems caused by over population People don’t have enough resources/ lack of work/inadequate water supply/ sanitation Over use of agricultural land/ overgrazing/ deforestation /loss of natural vegetation Poverty Death Malnutrition Poor access to education/ health care Over crowded housing High crime rates Congested roads

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