Honesty is ethically required

We have recently considered the question of whether it is ethically permissible to be deceptive in business, or instead, if there is some obligation to be honest/truthful. Holley discusses the ethical issue of deception and truthfulness in a particular area of business: Sales. He argues that a seller has some degree of obligation to disclose information and be truthful with buyers. However, the question is what degree of information disclosure/honesty is ethically required? Holley presents five different degrees or levels of requirement, ranging from a low/undemanding requirement, all the way up to high/very demanding requirement.
1) Briefly explain which level of requirement Holley endorses.
2) Do you agree or disagree with Holley that this is the ethically reasonable requirement? Why or why not?
3) If you do not agree with Holley, which alternative level of requirement would you endorse and why?
4) What would the requirement that Holley endorses say about the World Camera case? Did the sales person do anything ethically wrong? Why or why not?
5) If you endorsed a different level of requirement than Holley, what would the requirement that you endorse say about the World Camera case? Did the sales person do anything ethically wrong? Why or why not?