Answer:
The author wants to break from the narrative flow of the girl's story to give readers an authentic sense of life during the Depression.
Step-by-step explanation:
An interim chapter has the objective of joining two frames that circulate along different paths, but that in the end these frames meet and form a single plot. As is the case of the story of the "poor man's pie" presented in the passage that is enshrined in the plot of the story of the young girl who grew up during the Great Depression
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The author decided to add this paragraph so that readers have a perception of what life was like during the Great Depression and how they had to create ways to replace goods that were scarce or in small quantities.