Pulling rank or using caustic or critical comments about or to a person in the room is guaranteed to put a chill on proceedings. Getting to yes often involves a number of smaller agreements. Get agreements in writing. An agreement made out of politeness will later be reversed. In Mexico, because personal relationships are so important, many business transactions occur during meals.
Breakfast is the preferred event, often in an medium to expensive place.
The purpose is to get to know each other in a more intimate and informal setting, as well as exchange information and do business. The person inviting, or the person selling usually pays the bill. It is not split. Business is not discussed here. Your host is showing his respect and interest in you by inviting you to his home.