Final answer:
A promotional strategy, such as buy one get one free or reduced price appetizers during specific times, incentivizes guests to return to a restaurant.
Step-by-step explanation:
The revenue tool that provides guests with an incentive to return in the future by offering deals such as buy one, get one free, or reduced price appetizers on certain days or during specific hours is known as a promotional strategy. This approach is commonly utilized in the restaurant industry to increase customer traffic during off-peak times or to encourage repeat business. By providing special offers like reduced price appetizers on Tuesdays or during a happy hour between 5-7 pm, establishments create a sense of added value for the customer, making them more likely to come back.