What is the need of maintaining stocks in stores. Tell me

So you can sell more.

Prime is having a 'turn system' that gives you the count of the sales of each item and how much you sell of that item in a given period. Your sales increase and do not decrease because of being out of those high turning items. And allows for maximum sales due to having stock in those items.

Stringer

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So you don't run out of products in demand which in turn sells more!

Can't sell what you don't have.