In free markets, we tend to think of government regulation as bad: markets can regulate themselves and government regulation is ineffective and interferes with free market movements.
1) Does self-regulation work? Give examples of where it has worked well and where it has not. For this, think globally.
2) One argument is that self-regulated businesses with amenities attract more (and better) labor, forcing other businesses to improve in order to hire.
Case A: There are two businesses: S has excellent safety precautions while P does not. Both offer the same wage for the same job. Employees are attracted to S, so P must improve to get future employees. You can use the same argument for almost any benefit.
Case B: The same two firms, but now firm P pays a higher wage (perhaps even double).
Does S lower their standards and raise wages? How can S attract employees? The discussion should center on when self-regulation works, how to make it more effective and areas where self-regulation cannot be used (and why).