Who is Penny Yunuba from Your Money or Your Life and what is their importance?

Penny works in sales and is extremely successful in her career. None-the-less, she believes that life should be about more than working. Learning that the time will come when she will not have to work any more, frees her from the feeling that she needs to extra-enjoy every "free" moment. Penny increases her income by moving into the basement of her home and renting out her bedroom.