Stage 4 of DTM is likely to have countries with the highest life expectancy.
Birth and death rates are both low in Stage 4 of the Demographic Transition Model (DTM), maintaining population growth overall. Most Stage 4 nations' declining birth and mortality rates have been linked to their robust economies, highly educated populaces, population shift from rural to urban areas, and increased employment options for women.
The overall fertility rate falls as a result of these variables until it approaches replacement level, at which point the nation enters Stage 5. It is recognised that countries in Stage 4 of the DTM have made major economic and social strides that have made family sizes less than they were decades ago.
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