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Now that those competition were lost, and almost a month has passed since their death, the market had shifted a lot towards Frank's favor as more clients approach Frank to purchase his products. It appears that he has become quite popular now, and those shops that used to be of those he ended killing because they wanted to ruin him had not recovered well.
Somehow, because the owner changed, the prices began to shift as well, and a lot of a mess happened there, most of their usual clients were lost, and not many would stay loyal, no matter how fond you grow with a shop, money is what always drives people, those that sell cheaper and have the same products with the same quality, if not higher will end up always benefiting more because everyone just wants to save money.
Check "The Protagnist's Sister Is Actually the Strongest"!