I'm convinced that ideas and behaviors and new products move through a population very much like a disease does.

Superstar lawyers and math whizzes and software entrepreneurs appear at first blush to lie outside ordinary experience. But they don't. They are products of history and community, of opportunity and legacy. Their success is not exceptional or mysterious. It is grounded in a web of advantages and inheritances, some deserved, some not, some earned, some just plain lucky - but all critical to making them who they are. The outlier, in the end, is not an outlier at all.

Cultural legacies are powerful forces. They have deep roots and long lives. They persist, generation after generation, virtually intact, even as the economic and social and demographic conditions that spawned them have vanished, and they play such a role in directing attitudes and behavior that we cannot make sense of our world without them.

The Tipping Point is the biography of an idea, and the idea is very simple. It is that the best way to understand the emergence of fashion trends, the ebb and flow of crime waves, or, for that matter, the transformation of unknown books into bestsellers, or the rise of teenage smoking, or the phenomena of word of mouth, or any number of the other mysterious changes that mark everyday life is to think of them as epidemics. Ideas and products and messages and behaviors spread just like viruses do.

I think actually the marketing community is approaching a crisis: There are just too many messages competing for too little attention. That is the fundamental problem.

I'm in the storytelling business, and so you're always drawn to the unusual. And early on, I discovered that's the easiest way to tell stories... If you come up through a newspaper as I did, your whole goal is to get a story on the front page, and you only get something on the front page if it's unusual.

The ethics of plagiarism have turned into the narcissism of small differences: because journalism cannot own up to its heavily derivative nature, it must enforce originality on the level of the sentence.