A push of a button and price changes take place. Prices are updated in the POS system, at scales and shelf edge. Printing costs and human errors are minimized. This also applies to obsolete inventory: the price of slow-moving items can easily be lowered to sell them at a reduced price. Shelf space is quickly made available for faster selling articles and amount of scrap is minimized.
Why waste personnel's valuable time on changing paper labels, checking for errors and correcting? Why not let them concentrate on what really matters: customer service. You can also do inventory immediately as often as you wish.