When sales are through the roof you run into a very big problem (the kind of problem every Amazon and eBay seller wants): running out of inventory. In your next order, if you buy too much, you freeze up capital. Buy too little and you end up spending too much on shipping and risking running out of inventory which kills your BSR ranking.
In this video I walk you through a formula that shows you how to forecast how much inventory you are going to need based on how fast your product is selling.
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