Unit 2.8 · Market Failure: Externalities and Common Pool Resources
Socially Optimum Output (MSB = MSC)
AO2AO4Diagram required
Syllabus Requirement
Defines allocative efficiency where marginal social benefit equals marginal social cost, maximizing social/community surplus.
Assessment Objectives
AO2Application and Analysis
AO4Use of Appropriate Skills
Summary
The socially optimum output occurs when marginal social benefit equals marginal social cost (MSB = MSC), indicating allocative efficiency. This point maximizes community surplus and eliminates welfare loss from overproduction or underproduction. Understanding this concept is essential for evaluating market efficiency and the need for government intervention in the presence of externalities.