parece que é do senso comum... será...?

"Today’s New York Times features on its front page new research from the Russell Sage and Spencer foundations that concludes that the achievement gap between rich and poor is growing, and is now significantly larger than the gap between white and black students. This research is consistent with scholarship that The Century Foundation published in its 2010 volume, Rewarding Strivers , finding that the socioeconomic obstacles to doing well on the math and verbal SAT are seven times as large as those associated with race." 

aqui.

parece-me que por cá as coisas 'andam' no mesmíssimo sentido...