Can you test a Market without launching a Book?

Yes, actually you can. Here are a few ways Test the Keywords in Google Adwords using a Landing Page Test a Minimum Viable Product i.e. a short story or a novella that is similar in theme to the book you intend to write. Please Note: This has some downsides Use a Kindle Store Keyword Research Tool to see how much money people are actually making in that market Do Market Research and see how many...