What are the consequences of discrimination on a society between prejudice and discrimination?

Discrimination is the valuable and necessary determining and acting on the real differences among people. We necessarily discriminate between the skillful and the unskilled, between the honest and the dishonest, between the energetic and the lazy.

Prejudice is acting on differences among people without determining that they actually exist. To PRE-judge, means deciding to treat people differently BEFORE determining that they are actually different, merely assuming they are different.