Robert Cialdini's research was based on the fact that people tend to be consistent with their decisions.
It postulates the six principles of influence that are behind any attempt at persuasion, and are used to achieve the compliance of the receiver, these are:
By consensus principle, it is understood how we are more willing to approach something if we notice that it is scarce or difficult to achieve.
Therefore, we can conclude that Robert Cialdini's research was based on the fact that people tend to be consistent with their decisions.
Learn more about Robert Cialdini's research here: https://brainly.com/question/8829872