Population Growth (Cambridge (CIE) O Level Economics)

Revision Note

Steve Vorster

Written by: Steve Vorster

Reviewed by: Jenna Quinn

Factors that Affect Population Growth

  • Population refers to all of the inhabitants of a particular country

  • The population growth rate is the size of the change in the population of a country, expressed as a percentage 

  • The following factors affect population growth

    • The annual birth rate

    • The annual death rate

    • The net migration

      • A higher birth rate and lower death rate would both increase the population

      • More immigration than emigration would increase the growth rate

  • All countries have different rates of population growth

    • Population growth rates are currently highest in less economically developed countries such as Niger, Mali and Zambia

    • Population growth rates are lowest in more economically developed countries

    • In some MEDCs such as Italy and Japan, the population is decreasing as the number of deaths is higher than the number of births

Examiner Tips and Tricks

MCQ will often check your understanding of the differences between these terms. Remember immigration and emigration are not the same. Immigration is the inward movement of people into a country. Emigration is the outward movement of people from a country.

Reasons For Different Rates of Population Growth

  • There are two broad causes of population change

    • Migration (explained above)

    • Natural population change (birth rates and death rates)  

Natural causes of population change 

  • Natural change in population is calculated by deducting the death rate from the birth rate 

  • The following factors led to a decrease in the death rate 

    • The agricultural revolution led to higher yields and healthier, more varied diets

    • Improvements to medicine and medical care 

    • Improvements to technology and transport, leading to a wealthier population which increases life expectancy

    • Improved housing and sanitation 

  • The birth rate has remained high in LEDCs due to

    • Lack of access to family planning and contraception 

    • An increase in women surviving childbirth

    • Families continuing to have large numbers of children to look after their parents in old age and to help support the family

    • Culture of having larger families which takes many years to change

    • Religious reasons 

  • The birth rate has fallen significantly in many MEDCs due to

    • Increased access to family planning and contraception

    • Changing social norms which include starting families later, having fewer children, or remaining single

    • Increased costs of child rearing and university education

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Steve Vorster

Author: Steve Vorster

Expertise: Economics & Business Subject Lead

Steve has taught A Level, GCSE, IGCSE Business and Economics - as well as IBDP Economics and Business Management. He is an IBDP Examiner and IGCSE textbook author. His students regularly achieve 90-100% in their final exams. Steve has been the Assistant Head of Sixth Form for a school in Devon, and Head of Economics at the world's largest International school in Singapore. He loves to create resources which speed up student learning and are easily accessible by all.

Jenna Quinn

Author: Jenna Quinn

Expertise: Head of New Subjects

Jenna studied at Cardiff University before training to become a science teacher at the University of Bath specialising in Biology (although she loves teaching all three sciences at GCSE level!). Teaching is her passion, and with 10 years experience teaching across a wide range of specifications – from GCSE and A Level Biology in the UK to IGCSE and IB Biology internationally – she knows what is required to pass those Biology exams.