This document provides information about a BA 201 course on consumer choice and elasticity for week 4. It includes a link to download a tutorial on the topics, contact information for the course provider, and details on an assignment to describe the concepts of marginality and diminishing marginality using examples from the Great Depression era. Students are asked to explain how marginal tax rates and unemployment were affected during that time and cite sources using APA formatting. The assignment will be graded based on meeting criteria, understanding concepts, presenting ideas clearly, and proper writing mechanics.