The numbers decreased to 25 and 50 percent respectively for the youths once they reached their senior year.
When Coleman controlled for human capital, such as education and skills, the difference decreased to 11 percent.
As people grow older, they should decrease equity exposure to 60 or 65 percent, most advisers say.
The area's unemployment rate decreased to 3 percent in March 1988, about half the national average.
Its yield, which moves in the opposite direction from the price, decreased 9 basis points, to 5.29 percent.
The 7 percent tax will decrease to 5 percent on July 1, 2004.
The tax rate was decreased to 24 percent for all taxpayers.
By contrast, the white population will decrease to slightly less than 50 percent, from 73 percent in 1990.
That percentage is expected to decrease to 35 percent by 1992, the company said.
Among the major worker groups, the unemployment rate for adult men decreased to 8.0 percent in December.