Restaurants need to offer a healthy and cheaper lunch menu for working people.
While I lived in Paris the government demand restaurants to offer 1 option for working people. It’s a cheaper version (the same dish for dinner is at regular price). The government gives some incentives to the restaurants to be able to afford it.
But this allows for working people to be able to find a cheaper and healthier meal during lunch time. Considering that is the meal the majority of the people eat out of home.