4 ms·
> fertility rates tend to fall below the level needed to maintain the population, 2.1 children per woman. Why 2.1 and not 2?
by dumdumchan 3y ago
> fertility rates tend to fall below the level needed to maintain the population, 2.1 children per woman.
Why 2.1 and not 2?
- cedilla 3y ago0.1 kids per woman are expected to die without procreating.
- yakubin 3y agoSome percentage of children are going to die before getting a chance to have their own children.
- xadoc 3y ago"The United Nations Population Division defines sub-replacement fertility as any rate below approximately 2.1 children born per woman of childbearing age, but the threshold can be as high as 3.4 in some developing countries because of higher mortality rates. Taken globally, the total fertility rate at replacement was 2.33 children per woman in 2003" https://en.wikipedia.org/wiki/Sub-replacement_fertility https://en.wikipedia.org/wiki/Sub-replacement_fertility
- bambataa 3y agoTo account for people who die before reproducing.
- taneliv 3y agoI think at least infant mortality and gender imbalance at birth (more boys are born than girls) require it to be above 2.
- jacob171714 3y agoYou've got a like 1/9 chance of dying by 21 I've heard. It's probably wrong but a decent amount of people die before they are able to have kids so they add a 0.1 to the replacement level.
- glimshe 3y agoMore like 1-2% in the US, you can check it using an actuarial table: https://www.ssa.gov/oact/STATS/table4c6.html https://www.ssa.gov/oact/STATS/table4c6.html
- deleted 3y ago[deleted]