Do you find the end figures believable against other claims? I found them overly pessimistic but thats a non-scientific vibe view. Even on the most optimistic setting the $ per QALY seemed excessive.

Many of MacKenzie Scott's interventions are early age. The multiplier effect on the economy and life adjusted years should be huge by both supression of excess pregnancies and avoided child death and disease. Every avoided pregnancy is economically that woman being productive back in the workforce or managing the family on a lower overhead. Every avoided child death is 40-50 years of productive labour from that child. The soap and vaccines is $low. The life tail is enormous. If you figure the QALY for the woman lower since she's survived into post puberty, I get that but for the kids, its 50x or more on the spend.

I just found the $ per QALY way low. But, perhaps people with experience of delivery of services and aid into marginalised economies can explain?