DeepState
Multi-Strategy, Quant and Fundamental
- Joined
- 30 March 2014
- Posts
- 1,615
- Reactions
- 81
It's not just about women. There's something in the water about the men as well.
http://www.abc.net.au/news/2013-02-05/more-tv-means-less-sperm-study/4502820
Coupled with women starting to have kids in their 30s... when their male parters are likely to be in the 30s as well. Chances are the men exercise would also be less in that age cohert.
Correct. Thanks as always.
This analysis focuses on women as they are the delivery portal of the end fulfillment good.
However, it has always taken a man and a woman to make a baby - at least that's what they taught me. Unless the nature of the relationship between the age of men and women has changed a lot, the outcome can be represented by analyzing women alone as the base unit. All else equal, as male fertility declines with age, the fertility of a woman, as measured by these stats, falls as well by some amount. For any given age bracket the fertility would remain more or less similar (assuming male fertility is not changing materially through time). Reduced population fertility arises because there is a trend towards older parenthood.
Your point would be very pertinent if there was a growing age difference between men and women who enter into an arrangement of some sort to have a child. I am not aware of anything that is material on this or have any reason that it will change in one direction through time looking forwards. For a ten year 'explicit' forecasting horizon, population dynamics on this matter are pretty much set. It would be a worthy study for the IVF community and the ABS to examine whether the fertility rates of cougars or those who seek sugar daddies differs materially from those of their age-appropriate/conformist matched controls. If so, we'd need to allow for changing cross sectional properties if there was evidence of trends in this direction. Birds and bees will do as they do.
Nonetheless, I went for a bike ride today.