What is Transnational Migration?

A pattern of migration where individuals maintain active social, cultural, political, and economic ties to both their home country and their host country, engaging in regular cross-border travel, dual citizenship, and business activities.

What is the Dependency Ratio and why is an unbalanced ratio problematic?

The ratio of non-working age dependents (children under 15 and elderly over 64) to the working-age population (ages 15–64): $\text{Dependency Ratio} = \frac{\text{Pop 64}}{\text{Pop 15-64}} \times 100$. • High Youth Dependency: Strains education, healthcare, and job creation. • High Elderly Dependency: Strains pensions, elderly medical care, and shrinks tax base.

What characterizes hypothetical Stage 5 of the Demographic Transition Model?

• CBR drops significantly below CDR, resulting in a negative NIR and natural population decline. • Drivers: Urban lifestyle, high cost of child-rearing, aging populations (e.g., Japan, Germany, Italy, South Korea), leading to severe labor shortages and high dependency ratios.

What is an Ecumene in human geography?

The permanently inhabited and settled portion of the Earth's surface. Non-ecumene areas include extreme deserts, high polar ice caps, dense tundras, and rugged high-altitude peaks with insufficient warmth, water, or arable land.

How does an Internally Displaced Person (IDP) differ from a Refugee?

An IDP has fled their home due to conflict, persecution, or environmental disaster but remains within the geographic borders of their own sovereign country, meaning they do not qualify for international legal protections granted to refugees.

What is Carrying Capacity and how does technology alter it?

The maximum population size of a species that an environment can sustain indefinitely without environmental degradation. Technological advancements (synthetic fertilizers, desalination, GMOs, high-efficiency transport) can expand the human carrying capacity of a region.

What is the Demographic Dividend?

The accelerated economic growth potential that occurs when a nation's fertility rate declines rapidly, temporarily creating a large working-age population with relatively few young and elderly dependents, freeing capital for savings, investment, and female workforce participation.

Define Crude Birth Rate (CBR), Crude Death Rate (CDR), and Natural Increase Rate (NIR).

• Crude Birth Rate (CBR): Annual number of live births per 1,000 people. • Crude Death Rate (CDR): Annual number of deaths per 1,000 people. • Natural Increase Rate (NIR/RNI): Percentage annual growth rate excluding migration, calculated as: $\text{NIR} = \frac{\text{CBR} - \text{CDR}}{10}$.

Compare Pro-natalist and Anti-natalist population policies with historic examples.

• Pro-natalist: Policies designed to increase the fertility rate (e.g., French paid parental leaves and tax breaks, Singapore cash baby bonuses, Hungarian subsidized home mortgages for large families). • Anti-natalist: Policies designed to curb population growth (e.g., China's One-Child Policy 1979–2015, Indian state-sponsored sterilization campaigns).

What is Step Migration, and what are Intervening Obstacles and Intervening Opportunities?

• Step Migration: Incremental migration in stages (e.g., farm → rural village → small town → regional city → capital megacity). • Intervening Obstacle: Environmental, political, or economic barrier hindering migration (e.g., mountain range, border wall, strict visa requirement, lack of transit money). • Intervening Opportunity: An attractive opportunity encountered along the journey that causes the migrant to settle before reaching the original destination (e.g., finding a good job in an intermediate city).

What is an Asylee (Asylum Seeker)?

A person who has arrived in another country and formally applied for legal protection as a refugee under international law, but whose refugee status claim has not yet been definitively adjudicated.

Distinguish between Interregional, Intraregional, and International Migration.

• International Migration: Permanent movement across sovereign national borders (e.g., Mexico to US). • Interregional Migration: Movement from one geographic region to another within the same country (e.g., US Rust Belt to Sun Belt). • Intraregional Migration: Movement within the same geographic region (e.g., central city to suburbs, or rural to urban).

State at least four of E.G. Ravenstein's Laws of Migration (1885).

1. Most migrants travel only short distances within their native country. 2. Long-distance migrants typically head for major centers of commerce and industry. 3. Migration occurs in stages (step migration from rural to town, then town to metropolis). 4. Every migration stream produces a counter-stream. 5. Rural residents are more mobile than urban residents. 6. Historically, young single adult males dominated international migration (though female migration has increased substantially today).

What is Counterurbanization?

Net migration from urban and suburban areas to rural communities and small towns, driven by desire for lower housing costs, pastoral lifestyle, telecommuting/remote work, and retirement communities.

What is the Demographic Transition Model (DTM), and what drives changes in Stage 1?

The DTM models how national birth and death rates shift as an economy industrializes. • Stage 1 (Low Growth / High Stationary): High CBR and high CDR fluctuate due to epidemics, famines, and subsistence farming, resulting in very low NIR. No country is currently in Stage 1.

What causes the rapid population growth in Stage 2 of the Demographic Transition Model?

• CDR plummets dramatically due to the Industrial Revolution (18th-century Europe/North America) or the Medical Revolution (mid-20th-century developing world: vaccines, clean water, sewage systems). • CBR remains high due to agrarian customs and cultural inertia, causing NIR to surge to its historical peak.

What is Chain Migration?

A migration process in which prospective migrants follow relatives, friends, or fellow villagers who have previously emigrated to a specific destination, establishing ethnic enclaves (e.g., Little Italy, Chinatown).

Who are Neo-Malthusians and what is their contemporary concern?

Modern theorists (e.g., Paul Ehrlich, The Population Bomb) who argue that Malthusian crises are imminent not just because of food shortages, but because human population and industrial consumption exceed Earth's ecological capacity for clean fresh water, arable soil, fossil fuels, and atmospheric carbon absorption.

Distinguish between Push and Pull factors in migration with specific examples.

• Push Factors: Negative conditions driving people away from an origin (e.g., armed conflict, religious persecution, crop failure, natural disasters, unemployment). • Pull Factors: Positive conditions attracting people to a destination (e.g., high-paying jobs, political freedom, quality education, family reunification, safety).

What is Total Fertility Rate (TFR), and what is the demographic replacement-level fertility rate?

• Total Fertility Rate (TFR): The average number of children a woman will bear during her childbearing years (ages 15–49) based on current age-specific birth rates. • Replacement-level TFR: Approximately 2.1 children per woman in developed countries; any rate below 2.1 eventually causes population decline without net immigration.

What cultural and economic shifts characterize Stage 3 of the Demographic Transition Model?

• CBR drops sharply while CDR continues to decline slowly, causing NIR to decelerate. • Drivers: Urbanization (children become economic liabilities rather than agricultural assets), increased female literacy and workforce participation, delayed marriage, and widespread access to contraception.

What are Remittances and what impact do they have on developing economies?

Monetary transfers sent home by transnational migrant workers to families in their country of origin. In many developing nations (e.g., Mexico, Philippines, El Salvador), remittances exceed foreign direct investment and foreign aid, directly funding household food, healthcare, schooling, and housing.

What is Transhumance?

The seasonal, cyclical migration of pastoral livestock and herders between fixed highland summer pastures and lowland winter pastures (traditional in the Alps, Andes, and Caucasus).

What are the demographic indicators of Stage 4 of the Demographic Transition Model?

• Low CBR and low CDR equalize, resulting in Zero Population Growth (ZPG) or near-zero NIR (TFR around 2.1). • Characteristics: Predominantly urban/tertiary economies, high female tertiary education, smaller planned families, and longer life expectancy (e.g., US, Canada, Australia).

Compare Arithmetic Density, Physiological Density, and Agricultural Density.

• Arithmetic Density: Total population divided by total land area (basic measure of crowding). • Physiological Density: Total population divided by arable (farmable) land area (measures pressure on food-producing capacity). • Agricultural Density: Number of farmers divided by arable land area (high in developing nations with subsistence farming; low in developed nations with mechanized agriculture).

What were the intended and unintended consequences of China's One-Child Policy?

• Intended: Rapidly decelerated national population growth, preventing an estimated 400 million births. • Unintended: Extreme sex-ratio distortion at birth (due to cultural preference for sons leading to sex-selective abortion and female infanticide), a rapidly aging population (the '4-2-1 problem'), and future labor shortages.

What is the J-Curve vs S-Curve of population growth?

• J-Curve (Exponential Growth): Population grows unrestricted at a constant percentage rate without resource constraints. • S-Curve (Logistic Growth): Exponential growth slows as population approaches the environment's Carrying Capacity ($K$), stabilizing at equilibrium.

What are Guest Worker programs?

Government-sanctioned labor migration policies that admit foreign workers on temporary visas to fill low-wage, labor-deficient sectors (agriculture, construction, hospitality) without granting permanent citizenship rights (e.g., historic German Gastarbeiter, Persian Gulf Kafala system).

What is 'Brain Drain' and how does it affect peripheral sending nations?

The large-scale emigration of highly educated, skilled, and talented professionals (doctors, engineers, scientists, academics) from developing nations to core countries offering higher pay and better research facilities, depriving sending nations of critical human capital.

How do you interpret the shape of an expansive, constrictive, and stationary Population Pyramid?

• Expansive (Wide base, narrow top): High CBR, high youth dependency, rapid growth (e.g., Sub-Saharan Africa, Stage 2). • Stationary (Columnar / rectangular): Balanced cohorts, stable birth/death rates, slow growth (e.g., Scandinavian countries, Stage 4). • Constrictive (Narrow base, wide middle/top): Low CBR, aging population, shrinking youth cohort (e.g., Japan, Stage 5).

What is the Rule of 70 for population doubling time?

Doubling time in years is calculated by dividing 70 by the annual percentage rate of natural increase (NIR): $\text{Doubling Time} = \frac{70}{\text{NIR (\%)}}$. For example, a country with a 2% NIR doubles its population in approximately 35 years.

According to the 1951 UN Refugee Convention, what is a Refugee?

A person who is forced to cross an international border owing to a well-founded fear of persecution based on race, religion, nationality, membership in a particular social group, or political opinion, and cannot safely return home.

AP Human Geography: Population Dynamics, Demographic Transition & Migration

Exhaustive coverage of population metrics, the 5 stages of the Demographic Transition Model, population pyramids, epidemiological transitions, Malthusian theories, and Ravenstein's laws of migration.

Level: basic
Languages: en → en
Cards: 32
Markdown: AP Human Geography: Population Dynamics, Demographic Transition & Migration (.md)

Flashcards (32)

#	Front (Term / Question)	Back (Definition / Answer)
1	What is Transnational Migration?	A pattern of migration where individuals maintain active social, cultural, political, and economic ties to both their home country and their host country, engaging in regular cross-border travel, dual citizenship, and business activities.
2	What is the Dependency Ratio and why is an unbalanced ratio problematic?	The ratio of non-working age dependents (children under 15 and elderly over 64) to the working-age population (ages 15–64): $\text{Dependency Ratio} = \frac{\text{Pop < 15} + \text{Pop > 64}}{\text{Pop 15-64}} \times 100$. • High Youth Dependency: Strains education, healthcare, and job creation. • High Elderly Dependency: Strains pensions, elderly medical care, and shrinks tax base.
3	What characterizes hypothetical Stage 5 of the Demographic Transition Model?	• CBR drops significantly below CDR, resulting in a negative NIR and natural population decline. • Drivers: Urban lifestyle, high cost of child-rearing, aging populations (e.g., Japan, Germany, Italy, South Korea), leading to severe labor shortages and high dependency ratios.
4	What is an Ecumene in human geography?	The permanently inhabited and settled portion of the Earth's surface. Non-ecumene areas include extreme deserts, high polar ice caps, dense tundras, and rugged high-altitude peaks with insufficient warmth, water, or arable land.
5	How does an Internally Displaced Person (IDP) differ from a Refugee?	An IDP has fled their home due to conflict, persecution, or environmental disaster but remains within the geographic borders of their own sovereign country, meaning they do not qualify for international legal protections granted to refugees.
6	What is Carrying Capacity and how does technology alter it?	The maximum population size of a species that an environment can sustain indefinitely without environmental degradation. Technological advancements (synthetic fertilizers, desalination, GMOs, high-efficiency transport) can expand the human carrying capacity of a region.
7	What is the Demographic Dividend?	The accelerated economic growth potential that occurs when a nation's fertility rate declines rapidly, temporarily creating a large working-age population with relatively few young and elderly dependents, freeing capital for savings, investment, and female workforce participation.
8	Define Crude Birth Rate (CBR), Crude Death Rate (CDR), and Natural Increase Rate (NIR).	• Crude Birth Rate (CBR): Annual number of live births per 1,000 people. • Crude Death Rate (CDR): Annual number of deaths per 1,000 people. • Natural Increase Rate (NIR/RNI): Percentage annual growth rate excluding migration, calculated as: $\text{NIR} = \frac{\text{CBR} - \text{CDR}}{10}$.
9	Compare Pro-natalist and Anti-natalist population policies with historic examples.	• Pro-natalist: Policies designed to increase the fertility rate (e.g., French paid parental leaves and tax breaks, Singapore cash baby bonuses, Hungarian subsidized home mortgages for large families). • Anti-natalist: Policies designed to curb population growth (e.g., China's One-Child Policy 1979–2015, Indian state-sponsored sterilization campaigns).
10	What is Step Migration, and what are Intervening Obstacles and Intervening Opportunities?	• Step Migration: Incremental migration in stages (e.g., farm → rural village → small town → regional city → capital megacity). • Intervening Obstacle: Environmental, political, or economic barrier hindering migration (e.g., mountain range, border wall, strict visa requirement, lack of transit money). • Intervening Opportunity: An attractive opportunity encountered along the journey that causes the migrant to settle before reaching the original destination (e.g., finding a good job in an intermediate city).
11	What is an Asylee (Asylum Seeker)?	A person who has arrived in another country and formally applied for legal protection as a refugee under international law, but whose refugee status claim has not yet been definitively adjudicated.
12	Distinguish between Interregional, Intraregional, and International Migration.	• International Migration: Permanent movement across sovereign national borders (e.g., Mexico to US). • Interregional Migration: Movement from one geographic region to another within the same country (e.g., US Rust Belt to Sun Belt). • Intraregional Migration: Movement within the same geographic region (e.g., central city to suburbs, or rural to urban).
13	State at least four of E.G. Ravenstein's Laws of Migration (1885).	1. Most migrants travel only short distances within their native country. 2. Long-distance migrants typically head for major centers of commerce and industry. 3. Migration occurs in stages (step migration from rural to town, then town to metropolis). 4. Every migration stream produces a counter-stream. 5. Rural residents are more mobile than urban residents. 6. Historically, young single adult males dominated international migration (though female migration has increased substantially today).
14	What is Counterurbanization?	Net migration from urban and suburban areas to rural communities and small towns, driven by desire for lower housing costs, pastoral lifestyle, telecommuting/remote work, and retirement communities.
15	What is the Demographic Transition Model (DTM), and what drives changes in Stage 1?	The DTM models how national birth and death rates shift as an economy industrializes. • Stage 1 (Low Growth / High Stationary): High CBR and high CDR fluctuate due to epidemics, famines, and subsistence farming, resulting in very low NIR. No country is currently in Stage 1.
16	What causes the rapid population growth in Stage 2 of the Demographic Transition Model?	• CDR plummets dramatically due to the Industrial Revolution (18th-century Europe/North America) or the Medical Revolution (mid-20th-century developing world: vaccines, clean water, sewage systems). • CBR remains high due to agrarian customs and cultural inertia, causing NIR to surge to its historical peak.
17	What is Chain Migration?	A migration process in which prospective migrants follow relatives, friends, or fellow villagers who have previously emigrated to a specific destination, establishing ethnic enclaves (e.g., Little Italy, Chinatown).
18	Who are Neo-Malthusians and what is their contemporary concern?	Modern theorists (e.g., Paul Ehrlich, The Population Bomb) who argue that Malthusian crises are imminent not just because of food shortages, but because human population and industrial consumption exceed Earth's ecological capacity for clean fresh water, arable soil, fossil fuels, and atmospheric carbon absorption.
19	Distinguish between Push and Pull factors in migration with specific examples.	• Push Factors: Negative conditions driving people away from an origin (e.g., armed conflict, religious persecution, crop failure, natural disasters, unemployment). • Pull Factors: Positive conditions attracting people to a destination (e.g., high-paying jobs, political freedom, quality education, family reunification, safety).
20	What is Total Fertility Rate (TFR), and what is the demographic replacement-level fertility rate?	• Total Fertility Rate (TFR): The average number of children a woman will bear during her childbearing years (ages 15–49) based on current age-specific birth rates. • Replacement-level TFR: Approximately 2.1 children per woman in developed countries; any rate below 2.1 eventually causes population decline without net immigration.
21	What cultural and economic shifts characterize Stage 3 of the Demographic Transition Model?	• CBR drops sharply while CDR continues to decline slowly, causing NIR to decelerate. • Drivers: Urbanization (children become economic liabilities rather than agricultural assets), increased female literacy and workforce participation, delayed marriage, and widespread access to contraception.
22	What are Remittances and what impact do they have on developing economies?	Monetary transfers sent home by transnational migrant workers to families in their country of origin. In many developing nations (e.g., Mexico, Philippines, El Salvador), remittances exceed foreign direct investment and foreign aid, directly funding household food, healthcare, schooling, and housing.
23	What is Transhumance?	The seasonal, cyclical migration of pastoral livestock and herders between fixed highland summer pastures and lowland winter pastures (traditional in the Alps, Andes, and Caucasus).
24	What are the demographic indicators of Stage 4 of the Demographic Transition Model?	• Low CBR and low CDR equalize, resulting in Zero Population Growth (ZPG) or near-zero NIR (TFR around 2.1). • Characteristics: Predominantly urban/tertiary economies, high female tertiary education, smaller planned families, and longer life expectancy (e.g., US, Canada, Australia).
25	Compare Arithmetic Density, Physiological Density, and Agricultural Density.	• Arithmetic Density: Total population divided by total land area (basic measure of crowding). • Physiological Density: Total population divided by arable (farmable) land area (measures pressure on food-producing capacity). • Agricultural Density: Number of farmers divided by arable land area (high in developing nations with subsistence farming; low in developed nations with mechanized agriculture).
26	What were the intended and unintended consequences of China's One-Child Policy?	• Intended: Rapidly decelerated national population growth, preventing an estimated 400 million births. • Unintended: Extreme sex-ratio distortion at birth (due to cultural preference for sons leading to sex-selective abortion and female infanticide), a rapidly aging population (the '4-2-1 problem'), and future labor shortages.
27	What is the J-Curve vs S-Curve of population growth?	• J-Curve (Exponential Growth): Population grows unrestricted at a constant percentage rate without resource constraints. • S-Curve (Logistic Growth): Exponential growth slows as population approaches the environment's Carrying Capacity ($K$), stabilizing at equilibrium.
28	What are Guest Worker programs?	Government-sanctioned labor migration policies that admit foreign workers on temporary visas to fill low-wage, labor-deficient sectors (agriculture, construction, hospitality) without granting permanent citizenship rights (e.g., historic German Gastarbeiter, Persian Gulf Kafala system).
29	What is 'Brain Drain' and how does it affect peripheral sending nations?	The large-scale emigration of highly educated, skilled, and talented professionals (doctors, engineers, scientists, academics) from developing nations to core countries offering higher pay and better research facilities, depriving sending nations of critical human capital.
30	How do you interpret the shape of an expansive, constrictive, and stationary Population Pyramid?	• Expansive (Wide base, narrow top): High CBR, high youth dependency, rapid growth (e.g., Sub-Saharan Africa, Stage 2). • Stationary (Columnar / rectangular): Balanced cohorts, stable birth/death rates, slow growth (e.g., Scandinavian countries, Stage 4). • Constrictive (Narrow base, wide middle/top): Low CBR, aging population, shrinking youth cohort (e.g., Japan, Stage 5).
31	What is the Rule of 70 for population doubling time?	Doubling time in years is calculated by dividing 70 by the annual percentage rate of natural increase (NIR): $\text{Doubling Time} = \frac{70}{\text{NIR (\%)}}$. For example, a country with a 2% NIR doubles its population in approximately 35 years.
32	According to the 1951 UN Refugee Convention, what is a Refugee?	A person who is forced to cross an international border owing to a well-founded fear of persecution based on race, religion, nationality, membership in a particular social group, or political opinion, and cannot safely return home.