To boost sales in the customer demand for products and services. The falling prices as an incentive. For example The price range Tuesday to Thursday, a mid-week and rarely eating out together. But whether customers will be very few things you have to pay daily wages, utilities, etc. anyway, despite not earning as much as they should. But at least you do not have to pay the daily expenses of those wastes. In addition to lower prices down. Such a strategy would include an increase in price over time, with customer traffic as well.