Lunch is sacred in the Provence for most residents. Almost all employees of French companies get the "chèque Déjeuner" which they can use to eat outside the door at noon. The price of a "flat du jour" is often low priced to attract employees. Of course the tourists also benefit from this.... The daily menu stands for a fixed menu with some variation. The person who wants to order from the card or "a la carte" obviously pays more.