Stockouts, dead stock, inventory gaps: most losses come from five habits that are easy to fix.
The first mistake is having no reorder threshold. Without one, a stockout is discovered the moment a customer asks for the product — which is too late, and usually to the benefit of the competitor across the street.
The second is counting stock once a year. An annual inventory reveals a total discrepancy without ever explaining where it came from. Regular partial counts, by product family, take less time and catch problems while they're still small.
The third is not tracking expiry dates or batches. For a pharmacy, a drugstore or a grocery, that's a pure loss and entirely avoidable.
The fourth is mixing sales stock with display stock. Items in the window, damaged or lent out end up creating a permanent gap between the software's figure and what's on the shelf.
The fifth, and most common: recording deliveries several days after they arrive. During that gap your stock figures are wrong, and so are your reordering decisions.
None of these mistakes needs expensive software to fix — only a working habit, and a tool that doesn't make that habit painful.