Please help me answer these questions for my Ethics class:

1. What concept refers to the social cost of producing one additional unit of a resource, accounting for both negative and positive externalities? a) Intrinsic value b) Marginal social cost c) Peak production d) Hybrid approach
2. What term refers to something valued for its own sake, not just its usefulness? a) Instrumental value b) Transaction cost c) Intrinsic value d) External cost
3. What is the potential benefit of increasing access for persons with disabilities in the workplace? a) It will decrease competition for non-disabled individuals b) It will lead to lower labour costs c) It can unlock an untapped source of labour d) It will only create inconvinience for other emplyees.