"Intersectionality" by Irene Browne and Joya Misra

Essay

"Intersectionality" by Irene Browne and Joya Misra
Browne and Misra present a systematic analysis of "intersectionality," which focuses on gender, race, and class as mutually reinforcing forms of oppression and stratification. Significantly, while there is considerable variation in intersectionality approaches, common to them is the notion that each of the intersecting bases operates on each other, so that they cannot be analyzed separately. Developed primarily out of black feminist research, intersectionality research maintains that individual stratification experiences are simultaneously affected by all competing bases.
-What do Browne and Misra mean when they say intersectionality has more than an "additive effect" in structuring oppression by particular statuses such as race, class, and gender?