population must fall by 50% ! ... how?, page-31

Starburst I think that you are right about collapsing economies when there are too many older people.
Population starts to decline, then you have for example excess housing stock. House prices start to decline. No need to build new houses anymore. End of building industry . No point even renovating as in a declining market any reno is overcapitalizing.The banks then get hit because most loans have real estate as collateral in some form. Then move on to other industries.Ditto. Who would invest in industries in long term decline?
It will be interesting to see how Japan goes as population decline sets in.Last year their population declines by 10000, in future years it will be greater.

All of these population limiting proposals are by people that hate people.When they say that the world is overpopulated they really mean too many of them not too many of us, referring to themselves.
I think that the whole overpopulation theory is bogus. How much of the worlds resources are diverted by the arms industries, the drug trade, gambling and other useless or self defeating things? There is enough for all on earth if properly managed.