Final answer:
Intercalary chapters in The Grapes of Wrath are used to tell a bigger story about the Dust Bowl and present the big companies' points of view, while highlighting the contrast between the Joads and others.
Step-by-step explanation:
Intercalary chapters are used in The Grapes of Wrath to tell a bigger story about the Dust Bowl. These chapters explore the larger social, economic, and historical context surrounding the Joad family's journey. They provide a broader perspective by presenting the big companies' points of view, highlighting the contrast between the Joads and others.
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