It is understandable why this happens. When prices increase a lot in one area, relative to another, some people relocate to where prices are lower, especially if jobs are available. This certainly happened in the late 1990s/early 2000s, when there was a marked pick-up in people moving from New South Wales to Queensland following the big increase in housing prices in Sydney.
5  http://www.boj.or.jp/en/paym/fintech/index.htm/  13  Should the Bank of Japan Issue a Digital Currency?