American middle class - Wikipedia
Middle class income in major U.S. cities
Net Worth To Be In America's Upper, Middle & Lower Class
The Lost Decade of the Middle Class
What Income Level Makes You Rich? - A Wealth of Common Sense
net worth Archives - Page 3 of 7 - New Trader U
How the American middle class has changed in the past five decades
Net Worth and Income of the Top 20%, 10%, 5% & 1% In America
The Average Net Worth By Age For The Upper Middle Class
The Top 1% Officially Have More Money Than the Middle Class Combined