The role of paragraph 7 in an excerpt from Gadgets built Not to last is the consequences that can occur if we stop buying batteries.
What happened in Paragraph 7?
This refers to the incident that occurred that spurred the speaker to discuss the consequences that would happen if people stopped buying batteries.
Hence, we can see that the inference that can be made is that it was important to buy batteries because terrible consequences would occur when they were not bought.
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