Here's the view of the trader's professor (Peter Singer) on being ethical with one's money (in the first few minutes he gives his famous example of a child drowning). https://youtube.com/watch?v=dBvsZVlcXR4 (7 min)

This 14 min lecture goes through Singer's example, and it explores his view further. https://youtube.com/watch?v=Pyzv2UWzaos