My Favorite Godin Post: Hitting Lows before the High
sethgodin.typepad.com
sethgodin.typepad.com
Christensen's thesis is basically that technological change is continuously creating Local Mins like point C, in the form of disruptive innovations. These are technological breakthroughs that target a smaller, less profitable market. Since they're less profitable, they're unattractive to established players, who're stuck at point B. However, their performance can quickly improve up to point D.
As a startup, you want to enter at point C and target point D instead of going for point B. If you head for point B, you'll face the incumbents, all of whom have more resource than you. If you head for point D, the incumbents have to go down through point C in order to catch you. They won't want to do so, because it's painful for them.
http://sethgodin.typepad.com/seths_blog/2005/12/clean_firetruck.html