I agree with the notion that not speaking about money generally benefits companies more than employees. But I have been in situations where people were speaking about it, and refused to say what I make, precisely because they were making so much less than me. Now when that happens, I try to steer the conversation towards things that I think might help them get what they deserve. Some people feel so lucky to get a job that they take whatever's on offer, then they end up feeling screwed later and don't know what to do.