The Ming era Collected Works of Sung by writer Sung Lien contains a story called "Driving a Pig to Till a Field," the gist of which goes as follows: Shang Yu-tzu was very poor.
明代的宋濂《宋文公集遺編．雜著》也有一則＜駕豬耕田＞的故事，大意如下：