AfriGeneas Free Persons of Color Forum
"The Economics of Identity..."
The Economics of Identity and the Endogeneity of Race
This is a fairly recent scholarly article (Nov 2002, revised Feb 2000) looking at the impact of color - mulatto status on Free African Americans before the Civil War.
Written by Howard Bodenhorn & Christopher Ruebeck
Dept of Economics Lafeyette College
Has some interesting analysis of economic data and a full bibliography.