What is Disruptive Innovation Exactly? Definition
A "definition" of Disruptive Innovation that's frequently quoted is one which is located on Christensen's website. It reads:
"DISRUPTIVE INNOVATION describes a process by which a product or service takes root initially in simple applications at the bottom of a market and then relentlessly moves up market, eventually displacing established competitors".
So then here is my concern. We know that not every "product or service that takes root initially in simple applications at the bottom of a market" is a disruptive innovation, since there are a great number of products which occupy niches in which it appears they will remain for eternity without becoming the dominant means to accomplish (what is many times) the same function as that served by the more expensive product.
Therefore the defining term of Christensen's definition must be in "relentlessly moves up market, eventually displacing established competitors". But isnít the objective of all innovation, and particularly of sustaining (non-disruptive) innovation - e.g. to compete for and keep as much market share as possible on the basis of superior product and operational efficiencies?
So I take it then that while the conditions listed on Christensen's web page may be necessary for disruption, they are not sufficient.
What then ought we to suppose IS sufficient to differentiate Disruptive Innovation from all other innovation?
Or am I just interpreting this incorrectly?