The greatest measurable increase in life expectancy and quality of life happened in China during the second half of the 20th century, during which it developed from backwater feudalism to centrally planned socialism.
The greatest measurable reduction in life expectancy and quality of life occured in former Soviet countries in the 1990s, where they devolved from centrally planned socialism to internationally financed capitalism.
The greatest measurable increase in life expectancy and quality of life happened in China during the second half of the 20th century, during which it developed from backwater feudalism to centrally planned socialism.
The greatest measurable reduction in life expectancy and quality of life occured in former Soviet countries in the 1990s, where they devolved from centrally planned socialism to internationally financed capitalism.