What happened to marginal tax rates of individuals during the Great Depression

Use only the attached Chapter 7 and Special Topic 6 as a reference.
After reading chapter 7 and Special Topic 6, In one page describe the concept of marginality and diminishing marginality.  What happened to marginal tax rates of individuals during the Great Depression, and how did that affect unemployment during that time?  Why do you suppose?
Cite your sources as needed. Attempt to use APA formatting.

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