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Do note however, that when I say what has been selling, I'm referring to not only books being sold in stores, but also e-books, and books being contracted by authors and agents to the publishing houses. I differentiate these three because the timing on when they are written and published varies significantly, and if you are simply following the trends of what is selling on the best seller lists now, you'll be completely off base.
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I often find that when someone writes about a topic or place that they are not familiar with, small errors happen, and the material can sound forced, bringing the reader to question the authenticity of the facts and perhaps even disconnect them from the story.
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If that's you and your story, great, but you may still want to try to figure out if the story you are writing or want to write is going to be marketable and synchronized to the trend wave when you're ready to put it out there. If this is the case, then you should be looking at what's has already been published, and what the demands have been and are, to determine what will be in demand... or so out of the proverbial box, that everyone will want it.
I mentioned that we should differentiate between books based on timing. Let me expand a little bit more on this because too often I've seen and heard people try to work out their timelines for writing, pitching and releasing based on inaccurate presumptions.
So many times, I have been pitched a book by an author who tells me, "This is very timely, because there will be a TV show about this in the fall," or they say that the sequel to xyz is being released next month by such and such top publisher. When this happens I sit a little closer to the person, smile, and then I explain to them that if I get to read their manuscript within the next month in itself would probably be a miracle. Then I have to pitch it and sell it. Which takes more time, months on average. Then once the publisher signs the book they have their own editing and production timelines. So the story that they are pitching to me, if I (or another agent) end up signing it and sell it to a top house, will likely not be out for another 1-2 years, sometimes more.
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To figure out what has been selling, you should be looking at the best seller lists, reviews of purchases on Amazon and the such, book shelves and e-categories. The best seller lists going back as far as you're willing to extend your research will show you the most popular books with the best sales on a weekly basis. To do the best research, you should actually look at when that book was published (and the copyright notice on the first few pages because it may be a rerelease), and if you really want to figure out the timing, take a look at when that book was acquired by the publishing house to see how long it took them to release it. That's when you will start to get a full picture.
When you look for books on electronic sources like Amazon, Barnes & Noble, and the like, you can see most of the above stated information in the book's description page. You can also see how many reviews the book received, what those reviewers are reading (click on their user names), look up the books by category or genre and see what the amazing algorithms tell you. Amazon had these implemented these algorithms that allow them to use your purchase and browsing history to give you suggestions on what you may like, and to tell you what others that bought the book you're looking at purchased, and they even suggest more authors like the one you're looking at. I'm not sure how these Algorithms work, so take the suggestions as just that, suggestions. They may not be scientific evidence, but can be helpful none the less to gather info on the books, authors and readers. Another thing to keep in mind is that self published books, and there are a lot of them out there, are written and released a lot faster than those put out by publishers. So when you're looking at a book, it is important to note if the book was published by a publishing house, or if it was recently written and published by an independent author.
When a publishing house publishes a book, especially a paper book, it usually takes a minimum of six months to prepare and publish that book. Most publishing contracts allow publishers to take up to 18 months to put out a paper book. The reason why I'm telling you this is because if you're writing a trendy book now, and you pitch it to a publisher, that book will not be in stores for some time, so you may miss that trend completely. Especially if they take longer than six months to publish their books, and especially if you're targeting one of the top publishers and working with an agent. This info may help you decide to self publish, if you think that the work is time sensitive.
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In way of example, there are three or four bicker series that have just been started by successful enough independent authors. This should be something to keep in mind, because this should tell you that within the next year, they will all be putting out biker books months from each other. You need to be able to see that having these many books on bikers at once, will have an affect on the market. If you have a biker book, your decision should be to either publish it at the same time independently to ride the wave, or just hold off until they have finished their series and see if you can pick up their fans when they are done. When doing the latter, of course, you risk being too late. People may be sick of biker books by then, and all of the books on this topic may have already been sold. And so if you don't have something with a unique hook, you may hold off on that story all together and cut your losses. I don't make this suggestion lightly, but business calls are often hard to make. And good business people need to know when to make them.
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The same thing would apply to starting to pitch these types of books to agents or publishers, because by the time those books would release, the wave will likely have crested as well... if they even look at the books at all. Because agents and editors have a fairly good grasp about all of this and what they should be looking at. So if you get consistent declines on your work telling you that they already have similar projects in the work or published, then that should be your red flag.
Therefore, even though there really are no rules, and you really never know what will work in the market, because there are so many examples out there that have had unexplainable success. And there's no scientific way to know about new ideas, it is imperative to read and research the market to know what's been published, what has been doing well, what is coming out, and what will be out in the near future, because having this knowledge about the market will allow you to be able to determine with some logical certainty, whether and when it is the best time to pitch or publish your book.
Making an educated decision is always better than shooting in the dark, and then wondering why your didn't reach your target.
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Happy publishing!
~Marisa