As of the year 1999, is the pay received by women in the U.S. workforce higher or lower than that of men?

Answer 1

They're still earning less than men in 2004, not to talk about in 1999. You might find these articles interesting.

"Women Still Earning (Significantly) Less Than Men
By Jennifer Hicks June 7, 2004

The Census Bureau recently released a report that details the earning discrepancy between men and women. The results are not heartening." Con'td at the 1st link

"The wage gap
Why women are still paid less than men
By Evelyn Murphy and E.J. Graff | October 9, 2005" at the 2nd link

Answer 2

still lower, alas