"my earth Institute colleagues and I estimate that the combined cost of these improvements 

[Agricultural inputs: fertilisers, small-scale irrigation, etc

Investments in basic health: a village clinic for  5000 residents, anti-malarial bed nets, treatment for HIV/Aids etc

Investments in education: Meals for all children in primary school, expanded vocational training 

Power, transport and communications services: power line or diesel generators, for lights, schools, pumps for safe well water etc

Safe drinking water and sanitation: saving countless hours of toil each day fetching water ]

would total... $70 per-person in the village of Sauri "