张黎有20多年的销售经验，她很清楚每年甘草的正常需求量是多少。她会经常和周围认识的中药材销售商互通信息，比如哪种中药材不适合售卖，哪些药材适合立马出手。去年一整年，她注意到，很多中药材都在涨价，但最初大部分中药材实际上并未流通到药厂，而是像她这样的销售商彼此互相购买，或外来投资者趁机买入，想借此机会赚钱，导致大量中药材被囤起来。张黎称，中药材价格每被拉高一次，游资和散户就会售出一些药材。

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