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Understanding Intrinsic Demand, Organic Performance, and Extrinsic Demand

First, you might want to review Understanding Your Amazon Sales Rank … , if you haven’t already.

The way I understand book performance begins with the concepts of  “intrinsic” demand and  supply. Simply put, there are a certain number of people who, without any prompting from anyone, are already actively browsing for books about the topic of your book.

Then there are a certain number of books that come up in response to that search or come to mind as a result of prior marketing. Where your book ranks in the digital answer set is the result of a variety of complicated factors including keyword relevance, sales, publication date and so on; where your book ranks in “share of mind” is basically a function of your visibility.  The sales you’re seeing now are the intersection of the intrinsic demand and the supply of competitive books. This is what I think of as the book’s organic performance.  

 Figuring organic performance ahead of time is always a roll of the dice and I have been surprised quite often. For example, one of my most profitable books has been a 32-page color monograph called BB-67 Montana: Why She Matters Today about a never-built US super-ship.  While there are some clever and innovative things in the book that I continue to believe in, it is admittedly pretty darned short and that has sparked some negative reviews.  Nevertheless, it continues to sell steadily. Why?  I believe the book’s strong organic performance is the result of the intersection of supply and demand:

  • There is a large population of people who browse for books about battleships;
  • There are not a huge number of books published per year about battleships (24 in 2008 per Amazon search, only about half of which are actually on that topic); and
  • This is the only book specifically about this particular ship.

You can boost organic performance by generating extrinsic demand, i.e. doing things to get  get the book in front of people.  There is one fundamental problem with book marketing as opposed to, say, marketing cars or houses, which is that the total net revenue per unit is generally under < $10. That means that if you are paying anywhere near $10 in marketing to acquire each new sale, you are probably losing money. 

We are not operating at the scale of Proctor & Gamble where their  ad spending is so great that they can afford to drum up sales for detergent that costs $14.99 a bottle.  (And they probably have better margins on liquid soap than we do on books!)  

So you really have to watch your pennies with generating extrinsic demand.  Free is by far the best price, and fortunately, many of the most effective ways of generating extrinsic demand are in fact nearly free, such as making media appearances.

Understanding Your Amazon sales rank

I just came across the following online comments from a multiple New York Times-bestselling author, one of the authors I respect and enjoy most in all the world:

Ah, Amazon sales rankings.  What do these numbers — changing every hour
in their hypnotic fashion that drives authors mad — really mean?

Here’s the skinny:

Ranking above 10,000 — essentially meaningless.  At that point, the
books are in order by ISBN or alphabetically or something.  Don’t even look.

8k – 10 k — your title is selling one or two units a month, maybe.

4k – 7k — your title is selling one or two units a week.  Nationwide.

2 – 4 k — OK, maybe a little better than that.

Ranking below 1000 — Now, at 3 figures, we’re getting into “selling
briskly for its genre” territory.

Below 100 — Pay dirt at last.  A book pretty much has to attain and
sustain rankings at two figures to crack any of the bestseller lists; to
crack the big lists like the NYTimes, the title needs to hold well below 50.

The key thing about her comments is that the numbers are completely wrong.


It’s amazing, and depressing, that someone who should be extremely well informed by her publisher, is operating in a near complete informatoin vacuum. I try to give my authors a hell of a lot more transparency than that.

I am a publisher with more than 75 books in print (all POD, so 90% of my business is via Amazon) and I watch the sales ranks v. my inventory closely.

The real numbers are more like this. When a title hits

80,000 that means 1 sale today (within the last couple of hours)
40,000 = 2 sales today
20,000 = 4 sales today
10,000 = 8 sales today
and so on.

It’s a logarithmic function, so as sales rank decreases, unit sales rise exponentially. For a great explanation, see http://www.fonerbooks.com/surfing.html, and for the goriest possible details, see http://www.nimblebooks.com/wordpress/2006/06/power-law-converting-amazon-sales-ranks-to-units-sold/.

The trick is that the sales rank “decays” as soon as you sell a book, so if it’s down around 500,000 that means you haven’t sold a book for a week or so. 1,000,000 means you’re probably doing 1 or 2 a month. Whenever it bounces back up to around 80,000, that means a sale within the last hour or two.

You can follow all your titles (24 x 7, compulsively ;-) ) using free services www.salesrankexpress.com or titlez.com. After you watch them bounce up and down for a while, you’ll get a feeling for what’s happening.