The Millionaire Next Door: The Surprising Secrets of American s Wealthy By THOMAS J. STANLEY, and WILLIAM D. DANKO, | If an ancestry group has a high concentration of millionaires, what would we expect the income characteristics of that group to be? The expectation is that the group would have an equally high concentration of high-income producers. Income is highly correlated with net worth; more than two-thirds of the millionaires in America have annual household incomes of $100,000 or more. In fact, this correlation exists for all major ancestry groups but one: the Scottish. This group has a much higher number of high-net worth households than can be explained by the presence of high-income-producing households alone. High-income-producing Scottish-ancestry households account for less than 2 percent of all high-income households in America. But remember that the Scottish ancestry group accounts for percent of the millionaire households in America today. More than 60 percent of Scottish-ancestry millionaires have annual household incomes of less than $100,000. No other ancestry group has such a high concentration of millionaires from such a small concentration of high-income-producing households.