Answer: Many people enjoy using the honor system.
Step-by-step explanation:
The statement that support the claim in Freakonomics that “people are generally good even without enforcement” is that "Many people enjoy using the honor system".
A honor system is a system that is simply based on trust and honesty. In aa honor system, people know what's expected of them without being forced and supervised and they do whatever they need to do accordingly in a honest way.