Summary
Highlights
Infectious diseases, once thought to be cured, re-emerge, having developed resistance to drugs and antibiotics, leading to a decrease in life expectancy once again.
The ETM oversimplifies demographic change by focusing only on death rates and disease, and it fails to adequately account for poverty as a significant cause of disease spread and shortened lifespans.
Life expectancy further increases, and deaths are primarily caused by degenerative diseases of old age, such as heart disease and cancer, rather than infectious diseases.
Life expectancy reaches its highest point due to effective medical interventions for diseases from the third stage, like advanced treatments for heart disease and cancer.
Life expectancy increases significantly due to improved sanitation, access to nutritious food, and new medicines. However, pandemics (diseases spreading across regions) remain a major cause of death, especially in increasingly urbanized areas.
The DTM explains why patterns of population growth and decline occur over history by connecting changing birth and death rates to a country's level of development, from agrarian to industrial.
This stage represents pre-industrial, agrarian societies with high birth rates and high death rates, resulting in a stable or slightly fluctuating population. No countries currently exist in this stage.
This stage marks the beginning of industrialization. Birth rates remain high, but death rates drop significantly due to medical advancements, better food access, and vaccinations, leading to a population explosion. Many sub-Saharan African countries are in this stage.
Characterized by continued industrialization and economic prosperity, birth rates begin to decline rapidly, though still exceeding death rates, causing slow population growth. Many developing nations are in this stage.
In this fully industrialized stage, birth and death rates are close, leading to slow growth or stabilization of the population. Concerns shift to aging populations and care for the elderly. Most developed nations are in this stage.
A more recent addition to the model, this stage shows declining populations where the death rate exceeds the birth rate, leading to a natural decrease in population. Japan is an example of a country in this phase.
The DTM solely focuses on birth and death rates, neglecting migration, and was developed based on Western countries, potentially limiting its applicability to modern development in other regions.
The ETM explains demographic transition through the lens of disease and death rates, with epidemiology being the study of disease spread.
Characterized by high death rates from infectious diseases, poor nutrition, and other factors, resulting in a low life expectancy and unstable population growth.