I learned that during my first week of corporate life. By the second week, I had a pretty good understanding of the word “Faustian”.
As to the OP’s question: Not so much changed my mind, as learned the facts…
Prior to the SDMB, I *woefully *misunderstood the realities of income and wealth distribution in the US. My perceptions of “middle class” (and my own position in the hierarchy) were astoundingly wrong.
The board was also instrumental in convincing me to spend some time volunteering, and I’m starting my fourth year as a teacher (remedial adult stuff) in a shelter. I learned how astonishingly hard it is to get people out of poverty and reintegrated into the economy from this. I had no idea how difficult or frustrating this task is, so I guess it can be added to “things the Dope changed my mind about”.