People who live in First world nations need First world services and retirement plans. That takes people paying taxes and into those plans. Less people means less money in taxes and paid into retirement plans which means standard of living for retirees will go down. And if you say raise taxes on the people that you currently have that means less money in pockets of private companies thus they need less workers. Less workers means less people paying taxes. It a vicious circle.
QUOTE
"A nation requires a certain scale in the population to continue its momentum, but in Japan, we are confronting a serious combination of a low birthrate and an aging nation," said Kota Murase, a deputy director at Japan's Education Ministry. "Our pension system is already being tested to its limits. And with fewer young people in society, the question is: How are we going to sustain the elderly and the nation's future? We don't have a clear answer yet."
Go here if you want to read the whole story. Story from 2005 and called "A Baby Bust Empties Out Japan's Schools
Shrinking Population Called Greatest National Problem":
http://www.washingtonpost.com/wp-dyn/artic...8-2005Mar2.html QUOTE
Because of the prevalence of abortion and birth control, Japan, like Canada and many European nations, are facing a problem of too few people. The Asian nation is also seeing its population age and having too few workers to support the rash of retirees
Last above quote from new story from 2009 on Japan population:
http://www.lifenews.com/int1062.html