40% - 40% - 20%

When something starts to be taken as an example or as the saying it is repeated endlessly.
In the past a year, two; Pareto’s optimum and Rule 80 - 20 (most profit comes from customers that are regular. That 80 % of profit comes from 20 % of clients).

The tendency to identify the sources of profitability and creating products and services that will satisfy the regular clients who are a source of profit.

Thus, the analysis had shown in the range of products which are sold that standard version of the product is sold least, and most are sold or the premium version either the cheaper version.
The scale is 40 - 40 - 20 %, ie. 40 percent of the sale are premium (more expensive) products, 40 percent less expensive versions of products, and only 20 standard version.

From the knowledge what customers want, or more expensive either cheaper products, derives a tendency to eliminate the middle.
If not completely, then not be too much of importance, only to be present.

Same tendency of offline products is present and in the online world.

During time and due to the accumulation of standard products, and the importance of differentiation occurs or as the platform either as the fast and light variations.
Examples of platforms are Facebook, MySpace, YouTube, WordPress and examples of custom solutions that are easy to set up and placed on platforms as Facebook Pages, MySpace Music, video clips on YouTube, blogs on the WordPress platform ...
Those 20 percent, standard products are regular, standard sites.