From : http://sakuramochi.wordpress.com/2008/05/08/daikichis-salesmanship/
If you want to work on something, you gotta have good strategy. Daikichi learned how did his father never succeed selling food. It must be something wrong. Fortunately he meet a master (this part is absolutely fantasy….because the master is a cat who can talk and walk) who teach him marketing strategy. Daikichi challenges many great merchant and joint marketing competition.
Althought the manga quite short (only 4 volumes), it can be great lesson for us, especially those who concern of making more profit.