Book shops can reflect what the public is concerend

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I bet most of us have entered a book shop before to pick the books we want to read. Have you ever noticed that the kind of books that are best sellers are different all the times? I mean when the stock market is good, there are many investment related books on sale. When there are diseases being spread, most books discuss about health. Isn't it so funny that we can actually learn what people are more concerned now by walking into the book hops?