Isolating causal impact of early education access on long-run earnings

[Jason_L]

I'm a policy researcher drafting a report on the long-term effects of income inequality on social mobility, specifically focusing on how disparities in access to quality early childhood education and extracurricular opportunities create divergent life paths. I'm looking for robust longitudinal studies that track cohorts from similar socioeconomic starting points but with varying access to these resources, measuring outcomes like higher education attainment and career earnings decades later. For academics in this field, which datasets or research methodologies have you found most compelling for isolating the causal impact of these early-life investment gaps from other confounding factors like parental networks or neighborhood effects?