【Over 590,000 Copies Sold! Buzzing with Word-of-Mouth!】 ★Winner of the 2024 "Readers' Choice Business Book Grand Prix" Long Seller Award★ ★Top 10 "Annual Bestsellers" of 2024 (Business Books/According to surveys by Nippan and Tohan)★ ★Featured on "Kazlaser and Learn (Nippon TV)"★ Focusing on how to "spend" money, not just "save" it, This is an unprecedented "textbook on money." Economists, entrepreneurs, and the New York Times all rave about it! This book will completely transform your outlook on life. What is the "money usage that makes your life too rich?"