When I read the billionaire thread, it reminded me of a conversation I had with a friend about money. She said that in her mind, if she had $2 million, that would be her "we have plenty of money" number. They have 3 kids and 4 grand kids that they help financially and I'm sure they would like to leave an inheritance as well. This prompted me to think of what my own number would be, that number that comes up when you think, "Yes, that would be more than enough." Dh and I don't have kids so our main concerns would be health care and assisted living costs when we're older.
Obviously, there are lots of other factors that come into play, primarily pensions, SS, Medicare, and inheritance for some. But if you had none of those other sources of income or resources, and had to rely solely on your saved funds, what would be your "enough" number? The dollar amount that you feel would be enough for you to stop working and retire comfortably, knowing that your financial needs would be met.