[DM] On real estate busts and the demographic causes of Japanese deflation

[rfmcdonald]

During my recent break, two of my co-bloggers at Demography Matters one post each.

Scott Peterson made the point that countries expecting significantly that surge population declines over the 21st century--he raises Germany, Poland, Ukraine, and Russia--can't expect very dynamic real estate markets. I would add only that surges of immigration like the one that hit Spain can change things for a while, at least, and that the prospects won't be homogenous as populations change and redistribute themselves.

Claus Vistesen demonstrates, using the example of Japan, that demographics--specifically, age structures--play a critical role in economics, including deflation, and that the rapid aging of the Japanese population may be a primary cause of the country's deflationary pressures.

Long term projections in age structures are likely to be robust as they are a function of people already being born and while migration may change the course of ageing in any given country the fact that we are all ageing at one at the same time means that there are fewer migrants to go around. I would then claim that ageing does matter and that understanding how an economy such as Japan adapts to the ageing of its population remains one of the most vexing and important issues for social scientists and investors alike.

So when Kinmont implies that low fertility in Japan is a non-issue I have to strongly oppose. Just take a look at the chart above Kinmont himself uses. Fertility has been below replacement levels in Japan since 1970 and on current growth rates (assuming a constant growth rate of fertility which in itself is dubious to the extreme) fertility levels would reach replacement levels some time in 2030-40. So, that would be 60 years with below replacement fertility. Even if fertility in Japan (and again in most of the OECD) took a discrete jump to replacement levels it would do very little to change the outlook for ageing in the immediate future.

In claiming that demographics do not matter Chancellor are Kinmont are taking a very wide brush over the general recognition in the academic literature that our economic systems tend to hit a snag once fertility falls below a certain level (a TFR of 1.5). This is also called a fertility trap and what it means is that it becomes very difficult to escape negative population dynamics once they set in. I emphasize this since it highlights that we are not, as a friend of mine likes to point, simply shooting arrows into the void when we point to the importance of these issues. I recommend the following presentation by Wolfgang Lutz et al and the paper that goes with it or this old post at AFOE by Edward if you are still not convinced.

In terms of the postulated increase in Japanese fertility since the mid 2000 it is a positive development, but as is evident from the data this rebound is extremely uncertain. In addition, we need to know whether this is just an echo of the tempo effect (and thus how large the rebound is likely to be) or whether it reflects a real change in attitudes on quantity. I am open to contributions here but the only thing we can for certain is that ageing, in Japan and the rest of the OECD, will continue its march onwards. Here I also feel that Kinmont puts up a straw man when he invokes the idea of Japan's population going to zero[.]

Go, read.