It will be disheartening for the customers when see the tags so suddenly change when they buy the same items a day before. I saw one customer back out. She was already at the cashier counter in a big store near my place when she realized that the items she bought a day ago were not the same in price. She was mad, so she left the items on the counter and never paid. The items were already punched, but the cashier had no energy to shout at the customers. It was the fault of the business owner. He applied a black and white strategy which was a failure. Indeed, it never gave a profit but risk.