In this uncertain era of climate change, any strategy that can increase farm yield in resource-poor, rain-fed, agriculture-dependent regions, like sub-Saharan Africa, should be explored. Our study takes place in Namibia, a typical sub-Saharan African country exhibiting dry and vulnerable characteristics. Our estimation strategy is robust to selection bias caused by unobserved systematic differences and further validated by robustness tests to estimate the impact of joint decision-making on farm productivity and household outcomes.