This is a very important question. To say that there is no discrimination in the work place and in pay scales is to be ignorant to the problem. To be sure there have been strides in this area, but it is clear that more work needs to be done.
Let me give you a few examples of discrimination.
First, recently there has been a lawsuit against Walmart from women employees stating that they have been overlooked in promotions. This is more of a common thing that we might expect. Women, even today, still get paid less than men in many fields. Therefore, we can say that there is gender discrimination.
Second, there is also race discrimination in the workplace as well. People of color are less likely to get ahead in major companies in the world today. A simple test case from another field might help to elucidate this point. When the California State Universities got rid of quotas, Asians were admitted in greater numbers. 45% of the first year class was Asian (UCLA 2010). In managerial position, Asians are under represented. This shows discrimination in the work place.