When salespeople hope to close a deal, they may try doing favors for the client. In fact, scientists who study human behavior know that the opposite strategy can work: if you can get someone to do YOU a small favor, they are much more likely to grant a bigger one. This has been shown to work in many situations, including one experiment in which people agreed to have a large yard sign installed after first accepting a small window decal. A favor as simple as answering a request for the time of day can lead to granting more complex favors.
I'm weird. Chances are that you're weird. In fact the society you live in is probably weird too. Western, educated, industrialized, rich, democratic. It's an acronym that was new to me until I read this piece about the work of Joe Henrich, a professor in Psychology and Economics at the University of British Columbia.
Psychologists dub the tendency to presume that others react to the world in the exact same way we do as "projection." For example, an entrepreneur is reluctant to schmooze and unwilling to discuss his company in social settings for fear of annoying potential customers and investors.