The Millionaire Next Door: The Surprising Secrets of America's Wealthy

Blurb

The Millionaire Next Door: The Surprising Secrets of America's Wealthy is a 1996 book by Thomas J. Stanley and William D. Danko.
This book is a compilation of research done by the two authors in the profiles of 'millionaires'. In this case they used the term 'millionaire' to denote U.S. households with net-worths exceeding one million dollars.
The authors compare the behaviour of those they call UAWs and those who are PAWs.