This paper examines the effect of agricultural input subsidies (AIS) and agricultural extension services (AES) on farm labour productivity in plots planted with maize in Tanzania, using panel data from the National Panel Survey in Tanzania. To control for the endogeneity of the two programmes, a control function and instrumental variable approach is used to estimate the effects of AIS and AES on farm labour productivity. The results show that AIS and AES are significant in raising labour productivity in maize-planted plots. Similarly, AIS and AES are also effective in increasing land productivity in these plots. Moreover, each programme has comparable effects on land productivity and farm labour productivity. These findings imply that public investments in AIS and AES are effective in raising farm productivity.

中文翻译：

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农业投入补贴、推广服务和农业劳动生产率的关系：来自坦桑尼亚玉米农民的证据

本文利用坦桑尼亚国家面板调查的面板数据，研究了农业投入补贴（AIS）和农业推广服务（AES）对坦桑尼亚玉米种植地块农业劳动生产率的影响。为了控制这两个计划的内生性，使用控制函数和工具变量方法来估计 AIS 和 AES 对农业劳动生产率的影响。结果表明，AIS和AES对于提高玉米种植地劳动生产率具有显着效果。同样，AIS 和 AES 也能有效提高这些地块的土地生产力。此外，每个计划对土地生产率和农业劳动生产率的影响具有可比性。这些发现表明，对 AIS 和 AES 的公共投资可以有效提高农业生产力。