今昔物語集
The legend of the , also known as Daietsu or the Daikokumai, is a Japanese Buddhist folk tale about a poor man who becomes wealthy through a series of successive trades, starting with a single piece of straw. The story was likely written during the Heian period and was later collected into "Konjaku Monogatarishū" and "Uji Shūi Monogatari". It became popular during the Muromachi period. The legend has become a common anecdote in Japanese popular culture.