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by little_name 769 days ago
I don't know a case study but I was personally told by 2 different founders who had 100MM+ exits that their startup ideas were formed (at least partially) from brainstorm sessions. One guy even pointed to me the library where they had the whiteboard session which led to the idea that they exited in the end.

The SPC also have a blog that proposes brainstorming from -1 to 1: https://blog.southparkcommons.com/how-to-go-from-minus-1-to-...