<https://kitaguni-economics.com/indifference-curve/%e7%84%a1%e5%b7%ae%e5%88%a5%e6%9b%b2%e7%b7%9a-%e3%82%b0%e3%83%a9%e3%83%954/#authorImage>
<http://schema.org/caption>
"北国宗太郎"
<https://kitaguni-economics.com/indifference-curve/%E7%84%A1%E5%B7%AE%E5%88%A5%E6%9B%B2%E7%B7%9A-%E3%82%B0%E3%83%A9%E3%83%954/>