Sales tax rates aren't secret. Stores can set their prices with it in mind. Consumers are far less likely to have sales tax rates memorized and to go through the trouble of checking how things'll work out from the sticker price before they get to the register.
Sales tax rates aren't secret. Stores can set their prices with it in mind. Consumers are far less likely to have sales tax rates memorized and to go through the trouble of checking how things'll work out from the sticker price before they get to the register.