SWM
Fleet Admiral
Posts: 5928
Joined: Mon Jan 11, 2010 4:00 pm
Location: U.S. east coast
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Yes, a change in birth rate would indeed change demographics more quickly than the direct effects of prolong.
Let's assume that the Havenite young people immediately realize the effect prolong will have on their reproductive years and many start delaying childbirth. Let's also assume that in the long run they do not change how many children they have. Once the prolong recipients start dieing of old age (in a couple hundred years), we want Haven to head back back toward a steady state, births matching deaths.
So if childbirth years are extended by a factor of 10 (say, 250 years instead of 25 years), the birth rate for an individual person is divided by a factor of 10. In a couple hundred years, that will be balanced by the fact that there are 10 times as many women of birthing age at any given time, leading to the same overall birth rate as before. But until then, the total birth rate will be less than previously.
Let's say that normal child-bearing years is 20-45 years of age. If everyone makes the adjustment immediately, the birthrate just after prolong is introduced will drop to 10% of previous. As the first generation of prolong passes 45, the number of people still capable of bearing children will start rising, and the total birthrate will rise. After 80 years of prolong, people of child-bearing age will range from 20 to 105 (everyone with prolong and older than age 20). Total birth rate will have risen from 10% original to 34% original. Still much lower than before.
Of course, none of this would be as smooth as this analysis suggests. Nothing would be as abrupt, and the transition would take place over a longer time. In addition, I neglected to account for the fact that when the birth rate changes, 20 years later there will be fewer people entering child-bearing years, which will change the birth rate further. The whole thing could get messy. After 80 years, all of the people under age 75 would have been born after prolong, and potentially after the birth rate started changing.
While it is impossible to use this analysis to gauge actual numbers, it supports the idea that a widespread decision to delay childbirth could after a mere 80 years cause a serious reduction of the number of people of employment age (whether or not the retirement age changes). On the other hand, if it took forty or fifty years for people to change their habits and start delaying childbirth, there could actually be a significant increase in the number of people of employment age after 80 years.
Over several hundred years, we could expect the changes to balance out, but the transition period could be quite stressful on the economy. We don't have enough information about Havenite sociological patterns to decide which is more likely--a decrease in the number of people of employment age or an increase.
-------------------------------------------- Librarian: The Original Search Engine
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