a common way to wrap up business negotiations in a friendly, and altogether carioca way, is to invite the parties involved, out for a meal - food is heavily ingrained in carioca culture and is considered a uniting force with strong social importance.

the people of rio de janeiro are strongly connected to positive relations between friends, family and business associates, and food offers a way of securing these relationships in the pursuit of united interest - unless the local host invites first, a dinner invitation should come from the visitors - if invited, it is highly impolite not to accept, however if the cariocas decline an invitation there should be no insistence.     

lunches and dinners are seen as an opportunity to socialize and to get to know each other more in depth - cariocas prefer doing business with individuals they know beyond professional roles.