“What’s the best price – mathematically – to sell my e-book at?”

This, my friends, is a thorny, thorny question. It’s lucky I’m a mathematician, which means I can brush aside all sorts of difficulties about perceived value, psychology, price points and sales methods. Look at me, I’m practically an economist! [caption id=”attachment_975” align=”alignright” width=”300”] You get the best profits in the middle of the price range.[/caption]

## TL;DR version

Here’s a recipe to find the your optimal e-book pricing:

1. Find the highest price you can imagine anyone paying for your book
2. Halve it

That’s it. Look at the graph.

## What you just did there was applied calculus.

Seriously.

Now, I hinted before about some assumptions. Before all the marketing people, the ones who religiously read my blog, descend on me and say ‘e-book pricing isn’t really like that!’, I hear your objections. And I’m going to ignore them, because the beauty of maths is partly about starting from an ok-but-not-quite-right model and gradually refining it. (See also Newton=>Einstein, Lamarck=>Darwin, Early woo=>science).

What I’ve assumed is that people buy based solely on price. You’ll get the most ‘sales’ if you make it free (although you won’t make any money). I’ll call that number of sales $S$, for sales.

If you make it super-expensive, no-one at all will buy it. I’m going to call the highest price someone will pay, the highest possible price, or $H$.

## QED

You’re welcome to argue with the assumptions – please do that in the comments below – and next time I’ll show you how to price up something that has limits on, like your time, or the 100 physical books you have lying around.