13. 双寡头市场和古诺模型——首都师范大学
https://www.bilibili.com/video/BV1434y1S7kZ?p=15&spm_id_from=pageDriver&vd_source=3ad05e655a5ea14063a9fd1c0dcdee3e
https://www.bilibili.com/video/BV1434y1S7kZ?p=15&spm_id_from=pageDriver&vd_source=3ad05e655a5ea14063a9fd1c0dcdee3e