(i) Birth : Birth is the most important factor which is responsible for social differences. A person in India is considered of a low caste because of his birth in the lower class family. A Black is discriminated from White because of his colour which is once again controlled by birth. (ii) Differences based on choice : Some of the differences are based on our choices. For example, some people are atheists. They don’t believe in God or any religion. Differences also occur because of choice of occupation. Differences occur among the people because of different professions and economic activities also. (iii) Differences based on religion: Sometimes religion can be one of the causes of social differences. It is fairly common for people belonging to the same religion to feel that they do not belong to the same community because their caste or sect is very different. (iv) Differences based on economic status : Economic status can also be responsible for social differences. Rich and poor people belonging to the same community or religion or sect often do not keep close relations with each other as they feel that they are very different. ‘ (v) Differences based on caste/color : In many regions of the world people are differentiated on the basis of caste or colour. For example, in United States and South Africa Blacks were discriminated because of their skin color.