I found out about this "newsletter" on reddit/startups about a month ago, each monday they send you an email with a PDF where they break down an industry or a business concept.
Here is an example with the Job search industry : https://sparrk.co/assets/pdf/Spa...
I found them really interesting and well designed. The idea is to think about finding new ideas like a game, I like this approach.
AlgoTransparency