Chapter 2: Population and Health Lecture Notes

Vocabulary flashcards covering key demographic metrics, population density types, stages of transition, and health-related terminology from the Chapter 2 lecture transcript.

Arithmetic Density

The total number of people occupying an area of land, also referred to as population density. Formula: total population/total land area

• Core Concept: Measures general population concentration per unit of land.

• Limitation: Treats all land the same, hiding uninhabitable areas like deserts.

The Role of Education and Healthcare in Reducing Birth Rates

• Education (Developing): Delays marriage and first childbirth while shifting women into formal labor sectors.

• Education (Developed): Compresses the reproductive window as women prioritize advanced degrees and early careers.

• Healthcare (Developing): Lowers infant mortality, which ends the need for large "insurance families."

• Healthcare (Developed): Normalizes advanced family planning, while high childcare/pediatric costs suppress the desire for extra children.

Education and Health Care

With women staying in school longer, they would be more likely to gain economic control.

– With better education, women would better understand reproductive rights and select better methods of contraception.

– With improved health care programs, I M Rs would decline.

– With survival of more infants ensured, women would be more likely to choose to make more effective use of contraceptives to limit the number of children.

Two strategies have been successful in reducing birth rates

health care and contraception.

The Role of Contraception in Reducing Birth Rates

 In some developing countries, demand for contraceptive devices is greater than the available supply, so the principal family planning strategy is to distribute contraceptives cheaply and quickly.

– Many oppose birth-control programs for religious and political reasons.

• Direct Mechanism: Functions as the immediate, physical tool to control family size, independent of broad economic changes.

• Developed Regions: Widespread availability of modern, highly efficient methods stabilizes long-term sub-replacement fertility.

• Developing Regions: Acts as a powerful lever for rapid fertility drop, though its success is often slowed down by distribution gaps and social or religious barriers.

Human beings generally avoid these types of regions

harsh environments:

• Too dry

• Too cold

• Too mountainous

• Too wet

4 major population concentrations or regions in world

are East Asia, South Asia, Europe, and North America.

Near to oceans

• In river valley

• On fertile soils

• In temperate climates

Future population Trajectories of India, China, and Japan

• India: Young structure yields growth to a 1.7B peak by ~2060.

• China: Low TFR causes a steep contraction down to ~633M by 2100.

• Japan: Advanced Stage 5 aging drives a chronic, long-term labor squeeze.

• Unified Trend: All three nations face eventual structural aging, leaving them with highly strained dependency ratios over time.

reasons for emergence/re of infectious diseases including malaria,TB,HIV/AIDS

• Malaria: Mosquitoes evolved DDT resistance; parasites became immune to chloroquine.

• Tuberculosis (TB): Driven by crowded urban housing and the rise of Multi-Drug Resistant strains (MDR-TB).

• HIV/AIDS: Spread via global transit networks; destroys immune systems to trigger lethal TB co-infections

Explain the main reasons for the uneven distribution of the world’s human population.

The uneven distribution of the world's human population can be attributed to factors such as geography, climate, and availability of resources. Areas with fertile land, access to water, and favorable climates tend to have higher densities, while harsh environments can deter settlement. Additionally, social and economic factors, including urbanization and historical migration patterns, also influence population distribution.

Physiological Density

The total number of people per unit area of arable land, providing insight into the land's capacity to feed its population.

• High physiological density causes greater pressure on the land to produce enough food

• Formula: total population/arable(farmable)land area

• Core Concept: Measures pressure exerted by the total population on food-producing land.

• Significance: High density indicates severe resource stress and food security risks.

three types of population density

arithmetic, physiological, and agricultural

Agricultural Density

The ratio of the number of farmers to the total amount of arable land, reflecting the level of technology used in farming.

• Formula: total farmers/arable/farmable land area

• Core Concept: Measures the concentration of rural farmers on farmable land.

• Significance: Low density signals advanced technology, farm mechanization, and a developed economy.

Arable Land

Land that is suitable for agriculture or farming.

Population Cartogram

A map that displays the size of countries based on their population size rather than their actual land area.

A country with a large amount of arable land and a small number of farmers will have a

low agricultural density

Which stage of the demographic transition are the world's richest countries in?

stage 4

Natural Increase Rate (NIR)

The percentage by which a population grows in a year, calculated as the difference between births and deaths, excluding migration.

Doubling Time

The exact number of years needed to double a population, assuming a constant natural increase rate.

What leads to lower birth rate in developed countries?

•  Later age of marriage 26 vs. 16

•  Later age of first birth 28 vs. 17

•  Higher education

•  Women’s status

› Education and literacy

› Access to health care and contraception

› Work outside the home = autonomy = choice

•  Old age pensions and social security

•  Urbanization

•  Modern medicine and contraception

stage 1 of the demographic transition model (DTM).

(Low Growth)

• Very high CBR and CDR

• but, very low NIR

• This is the stage for most of human history, but no country remains in stage 1 today.

• During most of this stage, people depended on hunting and gathering for food. When food was easy to obtain, the population increases.

stage 2 of demographic transition

(High Growth): The Gambia -Primarily sub-Saharan African nations and regions suffering from prolonged civil instability

• High CBR, rapidly declining CDR, very high NIR

stage 3 demographic transition

(Moderate Growth): Mexico-Mostly newly industrialized, developing economies

• Rapidly declining C B R, moderately declining C D R, moderate N I R

• After 1974, a National Population Council promoted family planning, 40 percent of Mexico’s married women have sterilizations.

stage 4 demographic transition

(Low Growth): Denmark-Highly developed, post-industrial nations

• Very low CBR, low CDR, 0 or negative NIR

stage 5 demographic transition

Highly advanced economies experiencing demographic graying-Japan

• Germany

• Italy

• South Korea

predicted by demographers for some developed countries.

• Very low CBR, an increasing CDR, and a negative NIR.

health risks baby girls

– Around 700,000 female babies are “missing” every year in China and India, as a result of gender-based sex selection.

– The sex ratio is the standard biological measure of male to female babies that are born. It is established that around 105 male babies for every 100 female babies are born.

– The high sex ratios of China and India can be used to calculate the probable percent of “missing” baby girls.

– The United Nations concludes that the “root cause” of sex selection is gender inequality.

Population Structure Shifts

• Lower infant mortality: Widens the base of the population pyramid

• Higher life expectancy: Broadens the top of the pyramid

• Visual result: Transitions the pyramid from a triangle to a column shape

Crude Birth Rate (CBR)

The total number of live births occurring in a year for every $1,000$ people alive in a society.

Crude Death Rate (CDR)

The total number of deaths occurring in a year for every $1,000$ people alive in a society.

Total Fertility Rate (TFR)

The average number of children a woman is expected to have throughout her childbearing years, typically defined as ages $15$ to $49$.

• Replacement Level: Mathematically set at 2.1; a TFR below this value leads to an ultimate demographic contraction

• Significance: It is the primary toggle for global models; a tiny variance of 0.5 children dictates a multi-billion person gap by 2100.

Zero Population Growth (ZPG)

A condition where the Total Fertility Rate results in a population that neither grows nor declines, represented by an NIR of $0$.

Demographic Transition

The process of change in a country's population from high birth and death rates to low birth and death rates, involving four or five distinct stages.

Sex Ratio

A biological measure of male to female babies born, establishing a standard of approximately $105$ males for every $100$ females.

Maternal Mortality Rate

The annual number of female deaths per $100,000$ live births from causes specifically related to pregnancy or its management.

Infant Mortality Rate (IMR)

The annual number of deaths of infants under the age of $1$ year per $1,000$ live births.

Potential Support Ratio

The number of working-age people (ages $15$ to $64$) divided by the number of persons aged $65$ and older. Impact of longevity: Higher life expectancy drastically shrinks this ratio

• Economic strain: Fewer workers are left to support each retiree

Population Pyramid

A bar graph that displays the distribution of a place's population by age groups and gender.

Dependency Ratio

is the number of people who are too young or too old to work, compared to the number of people in their productive years

• Lower infant mortality: Temporarily increases the youth dependency burden

• Higher life expectancy: Creates a long-term elderly dependency burden

Life Expectancy

The average number of years an individual can be expected to live based on current medical and social conditions.

Epidemiologic Transition

The shift in primary causes of death associated with each stage of the demographic transition, moving from infectious diseases to chronic disorders.

stage 2 of the epidemiologic transition

•  Receding pandemics (rapidly declining CDR)

  • A pandemic is disease that occurs over a wide geographic area and affects a very high proportion of the population.

  • Cholera, contracted primarily from exposure to contaminated water, has been a troubling pandemic during the early years of stage 2 of the demographic transition.

• Leading Cause of Death: Wide-area waterborne and airborne infectious pandemics that begin to be contained

stage 3 of the epidemiologic transition

Degenerative diseases (moderately declining CDR)

• This is characterized by a decrease in deaths from infectious diseases and an increase in chronic disorders associated with aging.

• The two especially important chronic disorders in stage 3 are cardiovascular diseases, such as heart attacks, and various forms of

Leading Cause of Death: Chronic disorders associated with aging, poor diet, and sedentary lifestyles

stage 4 of the epidemiologic transition

Delayed Degenerative Diseases (Low but Increasing C D R)

• Cardiovascular diseases and cancers linger, but the life expectancy of older people is extended through medical advances.

• Consumption of non-nutritious food and sedentary behavior have resulted in an increase in obesity in stage 4 countries.

stage 5 of the epidemiologic transition

The reemergence of infectious and parasitic diseases in a highly developed world.

• Poverty

  • Unsanitary conditions and poor access to medical care

• Evolution

  • Development of resistance to drugs and other controls

• Improved travel

  • More rapid and widespread transportation of diseases

stage 1 of epidemiological transition

Pestilence and Famine

• Leading Cause of Death: Infectious and parasitic diseases, along with acute malnutrition, animal attacks, and violence

• Key Example: The Black Plague (Bubonic Plague)

• Demographic Context: High and fluctuating crude death rates (CDR) keep population growth low

elder support ratio

number of working-age people (ages 15 to 64) divided by the number of persons 65 and older

Pandemic

A disease that occurs over a very wide geographic area and affects an exceptionally high proportion of the population.

Malthus's Theory

human population grows exponentially while food production only grows arithmetically

• Core Premise: Population grows geometrically (1, 2, 4, 8,…), while food supply only grows arithmetically (1, 2, 3, 4,…)

• The Crisis: Population eventually outpaces resource availability, hitting a "Malthusian Catastrophe" resulting in famine, war, or disease

• Why It Failed: Malthus failed to predict structural agricultural technology booms (like the Green Revolution) and natural family size stabilization in urban societies

"The Malthusian Theory argues that if food resources grow at a rate of (1,2,3,4,5) then population will grow at a rate of (1,2,4,8 ?) What will be the next number in the population sequence according to Malthus?"

16

Overpopulation

A condition in which the number of people in an area exceeds the environment's capacity to support life at a decent standard of living.

Relocation Diffusion

The spread of a feature or trend, such as a pandemic, through the physical movement of people from one place to another.