http://www.capmag.com/article.asp?ID=1826.
Ayn Rand tells the tale convincingly. The BLUF of a good book entitled "Your Money or Your Life" is that money is your life energy. That is to say, the money you earn is what you get in exchange for your life energy. What does that make money worth to you? How much of your 'money' is someone else 'entitled to'? What if they are poor or unlucky, does that change the formula?