Here's why:
* It states the main argument or point of the paper. This argument is the central idea that the entire thesis will explore and support.
* It sets clear expectations for the reader. By knowing the main argument upfront, the reader can understand the direction of the paper and anticipate the evidence and analysis that will follow.
* It acts as a guide for the writer. The thesis statement serves as a roadmap for the writer, helping them stay focused and organized in their research and writing.
In essence, the thesis statement is a contract between the writer and the reader. The writer promises to deliver on the argument presented in the thesis statement, and the reader agrees to follow along and evaluate the evidence and analysis presented.