The excerpt below is taken from the wikipedia entry for Uncle Scrooge.
Carl Barks gave Scrooge a definite set of ethics that was in tone with the time he was supposed to have made his fortune. The robber barons and industrialists of the 1890–1920 era were McDuck's competition as he earned his fortune. Scrooge proudly asserts "I made it by being tougher than the toughies and smarter than the smarties! And I made it square!" It is obvious that Barks's creation is averse to dishonesty in the pursuit of money.Note that the author of the strip I've included is unknown, it could be Barks, but I don't think it is. Regardless, I hope you enjoy.
-Z