Answer:
Reciprocity Norm
Step-by-step explanation:
The Reciprocity Norm says that the positive actions motivates the positive actions from the other party. Suppose I know that my my friend needs money and I call him and ask him if he needs money then it is more probable that he will too call me when I need money in hard times. So my positive attitude has motivated my friend to call me and ask me if I need money. So in this scenario the employees hope for better outcome from the public whom they are offering free samples of chicken teriyaki. They hope that the customers will enjoy their food and will come later to their restaurant and keep visiting.