為什麼菁英都是細節控：主管很想送給菜鳥的一本書 (二手書交易資訊)

[{"sale_price":757,"disc":216,"prod_count":3,"sale_month":"202011","avg_price":252,"avg_disc":72},{"sale_price":723,"disc":207,"prod_count":3,"sale_month":"202012","avg_price":241,"avg_disc":69},{"sale_price":211,"disc":"60","prod_count":1,"sale_month":"202101","avg_price":211,"avg_disc":60}]