The Tipping Point: How Little Things Can - By Gladwell, Malcolm Page 0,2

mid 1960s to the late 1990s. It looks like a giant arch. In 1965, there were 200,000 crimes in the city and from that point on the number begins a sharp rise, doubling in two years and continuing almost unbroken until it hits 650,000 crimes a year in the mid 1970s. It stays steady at that level for the next two decades, before plunging downward in 1992 as sharply as it rose thirty years earlier. Crime did not taper off. It didn’t gently decelerate. It hit a certain point and jammed on the brakes.

These three characteristics—one, contagiousness; two, the fact that little causes can have big effects; and three, that change happens not gradually but at one dramatic moment —are the same three principles that define how measles moves through a grade school classroom or the flu attacks every winter. Of the three, the third trait—the idea that epidemics can rise or fall in one dramatic moment—is the most important, because it is the principle that makes sense of the first two and that permits the greatest insight into why modern change happens the way it does. The name given to that one dramatic moment in an epidemic when everything can change all at once is the Tipping Point.

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A world that follows the rules of epidemics is a very different place from the world we think we live in now. Think, for a moment, about the concept of contagiousness. If I say that word to you, you think of colds and the flu or perhaps something very dangerous like HIV or Ebola. We have, in our minds, a very specific, biological notion of what contagiousness means. But if there can be epidemics of crime or epidemics of fashion, there must be all kinds of things just as contagious as viruses. Have you ever thought about yawning, for instance? Yawning is a surprisingly powerful act. Just because you read the word “yawning” in the previous two sentences—and the two additional “yawns” in this sentence—a good number of you will probably yawn within the next few minutes. Even as I’m writing this, I’ve yawned twice. If you’re reading this in a public place, and you’ve just yawned, chances are that a good proportion of everyone who saw you yawn is now yawning too, and a good proportion of the people watching the people who watched you yawn are now yawning as well, and on and on, in an ever widening, yawning circle.

Yawning is incredibly contagious. I made some of you reading this yawn simply by writing the word “yawn.” The people who yawned when they saw you yawn, meanwhile, were infected by the sight of you yawning—which is a second kind of contagion. They might even have yawned if they only heard you yawn, because yawning is also aurally contagious: if you play an audiotape of a yawn to blind people, they’ll yawn too. And finally, if you yawned as you read this, did the thought cross your mind—however unconsciously and fleetingly—that you might be tired? I suspect that for some of you it did, which means that yawns can also be emotionally contagious. Simply by writing the word, I can plant a feeling in your mind. Can the flu virus do that? Contagiousness, in other words, is an unexpected property of all kinds of things, and we have to remember that, if we are to recognize and diagnose epidemic change.

The second of the principles of epidemics—that little changes can somehow have big effects—is also a fairly radical notion. We are, as humans, heavily socialized to make a kind of rough approximation between cause and effect. If we want to communicate a strong emotion, if we want to convince someone that, say, we love them, we realize that we need to speak passionately and forthrightly. If we want to break bad news to someone, we lower our voices and choose our words carefully. We are trained to think that what goes into any transaction or relationship or system must be directly related, in intensity and dimension, to what comes out. Consider, for example, the following puzzle. I give you a large piece of paper, and I ask you to fold it over once, and then take that folded paper and fold it over again, and then again, and again, until you have refolded the original paper 50 times. How tall do you think the final stack is going to be? In answer to that question, most people will fold the sheet in