Answer:
Here the real estate gents are using the rule of reciprocity persuasion technique.
Step-by-step explanation:
Reciprocity is one of the persuasion technique , and reciprocity is also know a s one of the important principles of influence. According to the rule of reciprocity, people usually hates it when they feel indebted to others, so when people receives any favors from others they feel obliged to return those favors.
Same thing is happening here as real estate agents are trying to return favor to the people who are going to attend their sales promotion meeting.