I believe the answer is: hidden
Johari window is a psychological tool that help people understand their relationships with other people around them. Hidden area in johari window refers to the area that individual keep as a secret from other people around us, until we manage to found a certain someone that we can fully trust.
Answer:
To avoid conflict in the society
To live peacefully
Karl Marx is the person who coined the term "conflict theory". He was using it in explaining conflict that resulted from the differences between social classes. Karl Marx said conflict resulted from the power differences between the social classes. His cure was the state should own all the property and industries then everyone should work for the common good of all.