Just a few manipulations of the book by Robert Cialdini "Psychology of influence":

1. Regulation mutual exchange

Explanation: arm offers a "gift", and then offers to buy something or take some action. Automatic reaction forces you to agree to its proposal, even if the size of your expenses is clearly inadequate to his gift.
Example: Hare Krishna in the street will not be asked a direct donation - they first give you a flower or a book (you absolutely unnecessary), and then say that in return, you can thank them by making a donation.

2. Agreement on assignment

The method of manipulation manipulator pushes clearly excessive demands and then "agree to a concession," with its goal - just the second requirement. You feel the need to agree (on the basis of mutual exchange rules), because you have done a favor and lost.
Example: in the expensive boutiques, first put the inflated prices and then announce discounts.

3. Commitment and consistency

Explanation: You encouraged to commit an act which would be a logical continuation of the subsequent action desired by the manipulator.
Example: filling in the questionnaire, "I would buy a certain product at a certain value," test-drive a car requires its subsequent purchase, delivery before the election badges "I vote for Ivanov," etc.

4. The principle of social proof

Explanation: According to this principle, we believe the correct behavior, which often exhibit other people in a similar situation.
Example: The phrase in advertising: "Millions of people have already tried the product X", "hundreds of reviews on our website," etc.

5. goodwill

Explanation: we most willingly agree to comply with those whom we know or who we like.
Example: the seller any unnecessary garbage says: "Your friend Ivanov advised me to write to you." In advertising specifically use only beautiful and famous.

6. Obedience to authority

Explanation: a man in the process of education laid the habit of obedience to authority, and this habit is very resistant and completely unconscious.
Example: Dr. House, touting a cure or something to do with medicine. Although the actor was not versed in medicine, many will stupidly follow his authoritative advice.

7. Principle deficit

Description: something that is rare or inaccessible, is in our eyes the value, the more, the more it is in short supply. People are also more likely to avoid the loss of existing than to buy new.
Example: "the number of new iphone 5 is limited to" - you can raise the price.