Horace Dediu:

The evidence suggests that Apple prefers to keep average pricing for all products constant. Individual variants are priced so that, as the category matures, the changing mix leads to consistency in price ownership.

Thus the iPhone can be seen as controlling the $650 point, the Mac $1200, the iPod $200 and the iPad $450. This pricing signals the product’s value and the value of the brand.

The signaling is not just to buyers but also to competitors. Ownership of price forces competitors to occupy adjacent brackets.

And:

The overall pattern looks like a staircase with a widening price range where the lowest price remains constant and the upper price rises every three years by $100.

The “floor” of the range is a consistent $400 while the “ceiling” has expanded from $700 to about $950.

This year’s ceiling is due for the fourth leg up and if the pattern persists, we should expect it to reach $1100.

Interesting look at Apple’s pricing models.