景気後退で市場縮小は当然 https://rio.st/2008/12/13/%e6%99%af%e6%b0%97%e5%be%8c%e9%80%80%e3%81%a7%e5%b8%82%e5%a0%b4%e7%b8%ae%e5%b0%8f%e3%81%af%e5%bd%93%e7%84%b6/