1st QUESTION: What does the principle of reciprocity state according to the text?

2nd QUESTION: What is the effect of unsolicited favors according to the studies mentioned above?

Increases the likelihood of accepting subsequent requests, such as buying raffle tickets
Increase sympathy for the person and nothing else
Reduce the perceived emotional debt
No effect if the favor is small

Causes immediate distrust on the part of the user
Guarantee purchases without product evaluation
Completely eliminates the need for sales
Positions the company as generous and inclines the user to reciprocate with subscription or purchase