For decades, researchers have documented large differences in average test scores between minority and white students and between poor and wealthy students. But a new study finds that Americans are more concerned about—and more supportive of proposals to close—wealth-based achievement gaps than Black-White or Hispanic-White gaps. “The achievement gap’s ubiquity in policy discourse and implications for American society make it important to understand the public’s beliefs about it,” say the study’s authors, Jon Valant and Daniel A. Newark. “Many proposals...