URL：https://www.researchgate.net/profile/Yasuyuki-Todo/publication/291952738/figure/fig1/AS:333372309164032@1456493560152/Geographical-distribution-of-trading-links-among-the-largest-500-companies-in-Japan-in.png
掲載元：https://www.researchgate.net/figure/Geographical-distribution-of-trading-links-among-the-largest-500-companies-in-Japan-in_fig1_291952738
