PhD in what? Not economics, obviously. Was the invention of the computer chip an act of profiteering? Should pharmaceutical companies pour millions of their own money into new drug research as an act of altruism?
Consider going to http://gregmankiw.blogspot.com/. Greg Mankiw teaches Econ at Harvard and wrote the world’s best selling book on the subject. Then, consider reading Milton Friedman’s classic “Capitalism and Freedom”. Start with the basics.