Book (Practical) Politics, economy and society Measures to Ensure That High-Quality Customers Account for 80% of Sales

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Politics, economy, and society
Why do I fail if I continue to take free measures? A system that prevents customers from leaving 「 customers who are suffering from a decrease in the number of members and who can be used by all companies and individuals, such as brick-and-mortar stores, mail-order services, SNS, and members-only businesses. 」 「 A way to get only excellent customers. 」 is in this one volume!