A Grocery/Department Stores Essential

We have gone to the grocery and department stores, restaurants, hotels, hospital, schools, and alike. What do you think is essential to them when it comes to financial point in the store? In the cashier area when a customer is going to check-out the goods he/she shops? Yes, retailers and the establishments I mentioned do need  POS systems to complete the buying transaction. It is indeed essential or a must! Come to think of it, without it, could the transaction be fast? Is the store or establishments adapts the modern way? Does it possess a accurate and quality commerce? What do you think?Yes, it does need it.