The document discusses socioeconomic inequalities in education outcomes in the UK. It summarizes that the attainment gap between high and low socioeconomic status (SES) children starts early and widens throughout school. By age 10, low SES children with initially high cognitive scores fall behind high SES peers with lower scores. These gaps continue into further education and career outcomes. The document examines potential causes such as differences in opportunities, resources, and expectations between high and low SES families and communities. It argues that reducing these inequalities could boost the UK economy by £1.3 trillion over 40 years through improved social mobility.