"The Millionaire Next Door" explores the investing habits, values
and beliefs of millionaires from a statistical perspective.
The book shows that many people with high incomes, luxury cars, and
houses in prestigious neighbourhoods often have a much lower net
worth than you might expect. These people spend as much money as
they make - sometimes more!
In contrast, actual millionaires (people with a net worth of one
million dollars or more) prefer to live well below their means and
believe that financial independence is more important than social
status.
I enjoyed "The Millionaire Next Door". It contains some very
powerful ideas and is a good primer on building personal wealth.