Briefly about manipulation from the book "Psychology of Influence" by Robert Cialdini

Commitment and consistency. Explanation: You are encouraged to take an action, the logical continuation of which will be a subsequent action that is desirable for the manipulator. Example: filling out a questionnaire “I would buy such and such a product at such and such a price”, a test drive of a car involves its subsequent purchase, the issuance of “I vote for John” badges before the elections, etc.