Extension Worker Network Collapse: Quantifying the Last-Mile Gap in Agricultural Advisory Services
Objective
Document the systematic defunding of agricultural extension networks across sub-Saharan Africa and quantify the resulting gap in smallholder farmer access to crop management advice
Methodology
Time-series analysis of extension worker density per farmer across 40 countries; correlation analysis between extension worker access and crop yield variance; case studies of successful low-tech extension models
Findings
Extension worker ratios declined from 1:400 farmers (1980s) to 1:3000+ (2023) across most of sub-Saharan Africa. Countries that maintained ratio above 1:1000 showed 23% lower yield variance during weather stress events. SMS and USSD-based advisory systems have demonstrated 15-30% adoption rates in pilots but face the same last-mile problem: farmers need a trusted local contact, not just a message service.
Key Assumptions
- •FAO data is representative of actual field conditions
- •Correlation between extension access and yield stability holds causally not just correlatively
Limitations
- •Data quality from conflict-affected regions is poor
- •Cannot isolate extension worker effect from other agricultural investments