I have previously written about non-linearity and how it messes with our reasoning. In business non-linearity abounds. One example that has been discussed a lot is the change between going from a price of 2 cents to 1 cent compared to the change with going from 1 cent to free. Twitter wouldn’t be twitter if it had charged just 1 cent per tweet. One area where this is also true but more subtle and less well understood is product simplicity. Steve Jobs is clearly on to something very powerful b...