As your product starts flying off the shelves, inventory levels will dip down quickly. So quickly that you will not have time to get a fresh supply in time to meet the next customer’s order.
The only metric that can help you stay afloat is Reorder Level, the exact stock point when it is time to replenish your stocks.
Wikipedia explains reorder level as the minimum amount of an item which a firm holds in stock, such that, when stock falls to this amount, the item must be reordered.
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