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2 and 3 are unlikely, most in store inventory and ordering systems are quite antiquated, not easily integrating with modern web technology, they also do not monitor things like shrink and shelf misplacement. Working with a large grocer, the best method for in stock is sales analysis.

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I've done multiple POS data integration products with retail sales and inventory data and have thought about the backend of this sort of app before. #2 is doable, the main problem is that every retailer has different systems. But it can be done with enough capital.

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