Demographic Transition and Population Pyramids (9B) - Psych & Soc

1. What is the total fertility rate (TFR) definition in demography?

   Average number of children a woman has over her lifetime. TFR estimates long-term population replacement potential, accounting for fertility patterns across reproductive ages.

2. What is a population pyramid?

   An age-by-sex distribution graph for a population. Shows age structure with males left, females right of center.

3. What is the demographic transition model (DTM) used to describe in populations over time?

   A stage model linking development to birth and death rate changes. It outlines the progression of societies from pre-industrial high rates to post-industrial low rates, correlating with economic and social advancements.

4. What defines DTM Stage 3 (late expanding) in terms of birth and death rates?

   Declining birth rate with low death rate; slowing growth. Urbanization and education reduce fertility as mortality stays low.

5. Which population pyramid shape indicates slow growth and low fertility?

   Stationary/rectangular pyramid with similar cohort widths. Equal-width bars show stable births and low mortality.

6. What is the defining pattern of Stage 5 in the demographic transition model (when included)?

   Birth rate below death rate; population decline and aging. Aging populations and below-replacement fertility cause natural decrease, straining resources with more elderly dependents.

7. What defines DTM Stage 2 (early expanding) in terms of birth and death rates?

   High birth rate with rapidly declining death rate; rapid growth. Better sanitation/medicine drops deaths while births stay high.

8. What is demographic momentum (population momentum)?

   Continued growth after fertility drops due to a large young cohort. Large reproductive-age cohorts produce many births despite low fertility.

9. What best characterizes DTM Stage 1 birth and death rates?

   High birth rate and high death rate; low net growth. Pre-industrial societies with minimal population growth.

10. What is the most likely DTM stage for a country with falling death rates but still-high birth rates?

    Stage 2. Stage 2 has declining death rates but fertility remains high.

11. Which population pyramid shape indicates rapid growth with a large youth cohort?

    Expansive (wide base, narrow top). Triangle shape indicates high birth rates and young population.

12. Which population pyramid shape indicates slow or zero growth with similar cohort sizes?

    Stationary (more rectangular). Equal-sized cohorts indicate stable birth and death rates.

13. What is infant mortality rate (IMR) in demographic terms?

    Deaths under age $1$ per $1{,}000$ live births per year. IMR reflects healthcare quality and socioeconomic conditions, serving as a key indicator of infant health risks.

14. Calculate RNI: CBR $= 30$ per $1{,}000$, CDR $= 10$ per $1{,}000$. What is RNI?

    $2\%$ per year. The formula yields positive RNI from high CBR exceeding CDR, typical of developing populations in transition.

15. Identify the pyramid feature most consistent with high infant and child mortality.

    A very steep taper from ages $0$–$4$ to older child cohorts. Sharp narrowing shows many children die before reaching older ages.

16. Identify the demographic term: growth rate equals natural increase plus net migration.

    Overall population growth rate. This term encompasses both intrinsic demographic changes and external migration effects on total population change.

17. What is the dependency ratio conceptually measuring?

    Dependents relative to working-age population. Ratio of young + old to working-age (15-64) population.

18. What is commonly meant by DTM Stage 5 in terms of population change?

    Birth rate falls below death rate; population decline. Some developed nations see fertility drop below replacement.

19. What is the crude death rate (CDR) definition used in population studies?

    Annual deaths per $1{,}000$ people. It quantifies mortality levels uniformly, facilitating analysis of health trends and population dynamics.

20. What does a population pyramid primarily display about a population?

    Age distribution by sex, typically in $5$-year cohorts. Pyramids visualize demographic structure, revealing growth patterns, sex imbalances, and cohort effects.

21. What is the defining pattern of Stage 4 in the demographic transition model?

    Low birth rate and low death rate; stable or slow growth. Modern societies achieve balance with low rates due to advanced healthcare and family planning, stabilizing population.

22. Identify the pyramid feature most consistent with a recent baby boom.

    A bulge in the youngest age cohorts. Large young cohorts indicate recent increase in births.

23. What is demographic momentum in the context of population growth?

    Continued growth after fertility drops due to a young age structure. Large youth cohorts ensure growth even at replacement fertility.

24. If a population pyramid has a narrow base and a large elderly share, what is the likely growth trend?

    Zero or negative growth (aging population). Few births (narrow base) means declining population.

25. Which DTM stage best matches: low death rate, falling birth rate, and continued but slowing growth?

    Stage 3. Classic Stage 3 pattern: mortality transition complete, fertility declining.

26. Which population pyramid shape indicates an aging population with low fertility (expansive, stationary, or constrictive)?

    Constrictive (narrow base, relatively wider middle/older cohorts). Low fertility creates smaller young cohorts than older ones.

27. Which DTM stage best matches a stationary, near-rectangular pyramid in a developed country?

    Stage $4$. Rectangular shape reflects low, stable vital rates.

28. Which DTM stage best matches a constrictive pyramid with aging population and shrinking base?

    Stage $5$. Constrictive shape indicates sub-replacement fertility.

29. If $\text{CBR}=30$ per $1000$ and $\text{CDR}=10$ per $1000$, what is natural increase?

    $20$ per $1000$ (about $2.0\%$ per year, ignoring migration). $30 - 10 = 20$ per $1000$ or $2\%$ annual growth.

30. What does total fertility rate (TFR) measure in a population?

    Average number of children born per woman over her lifetime. TFR estimates completed fertility for a synthetic cohort.

31. What is the formula for rate of natural increase (RNI) when migration is ignored?

    $\text{RNI} = \text{CBR} - \text{CDR}$. Natural increase equals crude birth rate minus crude death rate.

32. What is the dependency ratio conceptually measuring in a population?

    Nonworking-age dependents relative to working-age population. This ratio assesses economic burden, highlighting support needs for youth and elderly relative to the workforce.

33. Identify the population pyramid shape most consistent with rapid growth and high fertility.

    Expansive pyramid (broad base, narrow top). A wide base indicates high youth proportions from elevated births, signaling future expansion potential.

34. What is the defining pattern of Stage 2 in the demographic transition model?

    High birth rate with rapidly declining death rate; rapid growth. Improved healthcare and sanitation reduce mortality while cultural norms keep fertility high, leading to a population surge.

35. What defines DTM Stage 1 (high stationary) in terms of birth and death rates?

    High birth rate and high death rate; minimal net growth. Pre-industrial societies have high mortality offsetting high fertility.

36. What is replacement-level fertility in developed countries?

    Total fertility rate of about $2.1$ children per woman. Accounts for mortality; exactly $2.0$ would mean no growth.

37. What is the dependency ratio in demography intended to compare?

    Dependents (young and old) relative to working-age population. Measures economic burden of non-working age groups.

38. What best characterizes DTM Stage 3 changes in birth rate and growth?

    Birth rate declines; death rate low; growth slows. Urbanization and education reduce desired family size.

39. Identify the population pyramid shape most consistent with population decline and aging.

    Constrictive pyramid (narrow base, wider older cohorts). A tapering base shows low fertility, leading to an inverted shape with more elderly and overall shrinkage.

40. Which demographic transition stage best matches an expansive pyramid with falling death rates?

    Stage 2. Rapid growth from declining mortality and high fertility creates a broad-based pyramid typical of early industrialization.

41. What is the replacement-level fertility value for developed populations?

    Approximately $2.1$ children per woman. This threshold ensures population stability by compensating for infant mortality and non-reproductive individuals.

42. Which population pyramid shape indicates population decline with fewer young people than middle-aged?

    Constrictive (narrow base, larger middle/older cohorts). Inverted shape shows declining births and aging population.

43. What is the demographic transition model (DTM) intended to describe about a country over time?

    Shifts in birth and death rates as a country industrializes. DTM tracks how population dynamics change with industrialization.

44. Which population pyramid shape indicates population decline and aging?

    Constrictive (narrow base, wider middle/older cohorts). Inverted shape shows fewer births than older cohorts.

45. What is the demographic transition model (DTM)?

    A staged model linking development to birth/death rates and growth. Links population growth patterns to economic development stages.

46. Calculate RNI if $\text{CBR} = 30$ per $1000$ and $\text{CDR} = 10$ per $1000$ (ignore migration).

    $20$ per $1000$ per year (about $2.0\%$ per year). RNI = $30 - 10 = 20$ per $1000$ (divide by $10$ for percent).

47. Which population pyramid shape indicates rapid growth with high fertility?

    Expansive pyramid with a wide base. Triangle shape indicates many births and young population.

48. Identify the most likely cause of a sudden notch affecting mainly males in one adult age cohort.

    War or sex-specific mortality concentrated in that cohort. Wars disproportionately kill young adult males.

49. Identify the pyramid feature most consistent with high infant mortality.

    A steep drop from the youngest cohort to the next cohort. Many infants die before reaching age 1-4 cohort.

50. What defines DTM Stage 4 (low stationary) in terms of birth and death rates?

    Low birth rate and low death rate; stable or slow growth. Post-industrial equilibrium with both rates at low levels.

51. Which demographic transition stage is defined by falling death rate with high birth rate?

    Stage $2$ (transitional/early industrial). Death rates drop first, creating rapid population growth.

52. Which demographic transition stage best matches a constrictive pyramid with fertility below replacement?

    Stage 5. Sub-replacement fertility inverts the structure, with fewer young people causing decline and increased aging.

53. What is a population pyramid and what two variables does it display?

    Age distribution by sex, usually as horizontal bars by cohort. Males left, females right; width shows cohort size.

54. Which demographic transition stage is often described as very low birth rate causing decline?

    Stage $5$ (population decline). Birth rate falls below death rate, causing negative growth.

55. Identify the most likely interpretation of a large bulge in ages $15$–$24$ on a population pyramid.

    A past baby boom or cohort effect entering young adulthood. Echo effect from high births $15$-$24$ years ago.

56. What is population momentum in demography?

    Continued growth after fertility falls due to a large young cohort. A youthful age structure sustains growth through high reproductive potential despite reduced birth rates.

57. What is the formula for population growth rate when net migration is included?

    $\text{Growth rate} = (\text{CBR} - \text{CDR}) + \text{NMR}$. Total growth includes natural increase plus net migration rate.

58. What is the formula for population growth rate using crude rates?

    $\text{Growth rate} = \text{CBR} - \text{CDR}$ (ignoring migration). Natural increase equals births minus deaths per 1000 population.

59. In the DTM, what key change most directly drives the death-rate drop in Stage $2$?

    Improved sanitation, nutrition, and medical/public health measures. These improvements reduce disease and increase survival rates.

60. Which DTM stage best matches an expansive pyramid with a very wide base and narrow top?

    Stage $2$. Expansive pyramids match high birth, declining death rates.

61. What is the approximate replacement-level fertility in developed countries?

    About $2.1$ births per woman. Accounts for infant mortality; exactly $2.0$ would mean decline.

62. What best characterizes DTM Stage 5 population change?

    Birth rate below death rate; zero or negative natural increase. Very low fertility leads to population decline without immigration.

63. Which population pyramid shape indicates rapid growth and high fertility (expansive, stationary, or constrictive)?

    Expansive (broad base, narrow top). Wide base from high fertility; narrows due to mortality.

64. What two rates primarily determine a population's rate of natural increase (RNI)?

    Crude birth rate and crude death rate. RNI measures population growth from births minus deaths only.

65. What is the formula for rate of natural increase (RNI) using birth and death rates?

    $\text{RNI} = \text{CBR} - \text{CDR}$. Subtracts crude death rate from crude birth rate for natural growth.

66. Which demographic transition stage has low birth rate and low death rate with stable population?

    Stage $4$ (postindustrial). Both rates stabilize at low levels, growth near zero.

67. What is life expectancy at birth in population health statistics?

    Average expected years of life for a newborn given current rates. It projects survival based on current age-specific mortality, influencing policy on aging and healthcare.

68. Which demographic transition stage best matches a rectangular pyramid with low birth and death rates?

    Stage 4. Low, balanced rates produce even cohort sizes, indicating zero or minimal natural increase in mature economies.

69. What is the demographic transition model (DTM) used to describe in populations?

    How birth and death rates change with economic development over time. DTM shows population patterns as societies industrialize and modernize.

70. What best characterizes DTM Stage 4 birth and death rates?

    Low birth rate and low death rate; stable or slow growth. Post-industrial equilibrium with near-zero natural increase.

71. Which DTM stage typically has the highest rate of natural increase (RNI)?

    Stage 2. Maximum gap between births and deaths occurs in early transition.

72. What best characterizes DTM Stage 2 changes in death rate and growth?

    Death rate falls sharply; birth rate stays high; rapid growth. Improved sanitation/medicine drops deaths before births decline.

73. What is the defining pattern of Stage 3 in the demographic transition model?

    Declining birth rate with low death rate; growth slows. Urbanization and education lower birth rates as death rates stabilize, moderating the expansion.

74. Identify the pyramid feature most consistent with a recent baby boom.

    A bulge in younger cohorts (wider bars at low ages). Baby boom creates wider bars at those birth years.

75. Calculate RNI: CBR $= 12$ per $1{,}000$, CDR $= 14$ per $1{,}000$. What is RNI?

    $-0.2\%$ per year. Negative RNI results when CDR surpasses CBR, indicating natural decrease common in aging societies.

76. What is the crude birth rate (CBR) definition used in population studies?

    Annual births per $1{,}000$ people. This metric provides a standardized measure of fertility, allowing comparisons across populations regardless of size.

77. What is a population pyramid designed to display about a population at a given time?

    Age distribution by sex (typically in $5$-year cohorts). Shows population structure with males on left, females on right.

78. What is the defining pattern of Stage 1 in the demographic transition model?

    High birth rate and high death rate; low net growth. Pre-industrial societies maintain equilibrium through balanced high rates, resulting in minimal population change.

79. In the DTM, what social changes commonly contribute to the birth-rate drop in Stage $3$?

    Contraception, female education/employment, urbanization, lower infant mortality. These factors reduce desired family size and enable family planning.

80. State the formula for the rate of natural increase (RNI) using CBR and CDR.

    $\text{RNI} = \frac{\text{CBR} - \text{CDR}}{10}$ (percent per year). Dividing the difference by 10 converts the per-thousand rates to a percentage, indicating natural population change.

81. Which demographic transition stage is defined by falling birth rate with low death rate?

    Stage $3$ (industrial/late industrial). Birth rates decline to match already-low death rates.

82. Identify the population pyramid shape most consistent with stable growth and low fertility.

    Stationary/rectangular pyramid (similar cohort widths). Uniform widths reflect balanced birth and death rates, maintaining constant population size over time.

83. What is the dependency ratio intended to capture about a population?

    Burden on working-age group from young and old dependents. Ratio of non-working ages to working-age population.

84. What demographic transition stage has high birth rate and high death rate with slow growth?

    Stage $1$ (preindustrial). Both rates are high, resulting in minimal population change.

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