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Joel on Software

2000/04/23

by Joel Spolsky
Sunday, April 23, 2000

When charitable organizations send you a request for a donation, they almost always include a "gift" in the envelope. Sticky labels with your address on them. Or a couple of blank greeting cards. The reason they're giving you the gift is because of the social principle of reciprocity; now you will feel obliged to give something back.

You've probably heard the expression "hurry, supplies are limited!" so many times in television advertisements that it hardly registers any more. But it's there because of the principle of scarcity; your natural assumption that something that is scarce is worth more money.

These tricks, among others, are used by salespeople, marketers, and advertisers to influence people to behave in a certain way.

Every couple of years or so, I reread a great book about the psychological theories behind the science and practice of influencing the behavior of other people: Robert B. Cialdini's classic Influence. This was assigned reading in Psych 110 at Yale, and one of the most popular textbooks of the year. I assure you that every beginning car salesperson and advertising copy writer is reading this book, and you should too, if only in self-defense!


Have you been wondering about Distributed Version Control? It has been a huge productivity boon for us, so I wrote Hg Init, a Mercurial tutorial—check it out!

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I’m Joel Spolsky, co-founder of Trello and Fog Creek Software, and CEO of Stack Exchange. More about me.

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