Final answer:
Carol Stack researched and documented the experiences of low-wage workers in her book "All Our Kin".
Step-by-step explanation:
Carol Stack conducted research on "The Flats" and discovered the challenges and hardships faced by low-wage workers. In her book "All Our Kin", Stack explored the lives of families living in a poor urban neighborhood, highlighting the complex social networks and support systems that emerged in such communities. Through her research, Stack shed light on the struggles faced by working-class individuals and the resilience they exhibited in the face of poverty.