直擊本質的思考力：菁英如何突破盲點、抓住問題根源、做出精準決策，解決所有難題 (二手書交易資訊)

[{"sale_price":250,"disc":"66","prod_count":1,"sale_month":"202009","avg_price":250,"avg_disc":66},{"sale_price":270,"disc":"71","prod_count":1,"sale_month":"202010","avg_price":270,"avg_disc":71},{"sale_price":210,"disc":"55","prod_count":1,"sale_month":"202011","avg_price":210,"avg_disc":55},{"sale_price":260,"disc":"68","prod_count":1,"sale_month":"202101","avg_price":260,"avg_disc":68}]