What's does the mutual reward theory state?

The Mutual Reward Theory states that a relationship between two people is enhanced when there is a satisfactory balance of rewards between them as perceived by each individual. the relationship becomes a lot stronger and permanent when the rewards are equally balanced out. furthermore, the relationships are strengthened when the persons involved help or reinforce one another. In simplest terms, If you are running a business, this means that both managerial positions and employees should feel that they are appreciated.

You should see a little paperclip on the bottom left corner you click on it and it gives you two options (camera and gallery)

I'm thinking it's the egg beater.