There is the asymmetry between up and down when you're talking exponential's. Up gets steeper and steeper until something happens. We probably don't want to fi

There is the asymmetry between up and down when you're talking exponential's. Up gets steeper and steeper until something happens. We probably don't want to find out what. The way down has a very long tail. Japan's population at this rate will decline to 50 million over a 100 years. A lot can happen in 100 years. And it's not clear that the current trend will continue. I'm sure people on the tip top of the wealth/population pyramid are freaking out that the thing will start getting smaller. I'm dubious there is a net negative for the people on the bottom. Right now rents have been gamed up, labor power is weak. A falling population will reverse that.