The behavior in a crowd which is dictated by the circumstances is called as the collective behavior, in which a person behaves according to the circumstances even if he or she is not willing to do that personally.
Yes i can remember a situation where i got stuck in a similar scenario. I was with my friends in the university after the classes in the executive hall, when a flash mob enters the hall and asked for raising the money for charity to help poor children with their studies. I personally didn't want to pay them a penny because i knew them well and i knew that they would not give a single penny in the charity for children studies. But i had to help them and give them money because of the circumstance over there, because they were yelling, forcing people, blackmailing people on the name of religion and helping poor, and because of this, i had to help them.
This was the time i was so dictated by the circumstances.
An example of something that isn't a command economy is the US (which has a mixed economy). A command economy is one that is used in China and Cuba today and was used for the Soviet Union.
