Ryan D'Agostino wanted to know how the extremely wealthy in America got that way So he asked Knocking on 500 doors in twenty neighborhoods in the most affluent ZIP codes in America  D'Agostino met with fifty regular (but very rich) men and women who welcomed him in and shared some of their most difficult financial decisions  toughest setbacks  greatest strategies  most triumphant moments  and deepest insights into what it means to have money