Ultimatums, blackmail & negotiations

I was telling the kids about the book Ultimatum that I am reading. They wanted to know what the word meant. When I explained it N asked whether that wasn't the same as blackmail. I explained the difference... We then got into a conversation about negotiations and the importance of not negotiating with yourself. If you are negotiating and the other side doesn't respond, do not improve your offer. Wait for the other side to respond with something. Otherwise, you are negotiating against yourself...