牛丼一杯の儲けは9円
Subtitle: "rieki" to "shiire" no jingi naki keizaigaku
By: Sakaguchi Takanori
Series: Gentōsha shinsho -- 071
Publisher: Gentōsha
Published: 2008
Place of publication: Tōkyō
Language: jpn
Number of pages: 222
ISBN-13: 9784344980709
Other titles: Gyūdon ippai no mōke wa 9-en