The Green Revolution, which bolstered agricultural yields and economic well-being in Asia and Latin America beginning in the 1960s, largely bypassed sub-Saharan Africa. We study the first randomized controlled trial of a government-implemented input subsidy program (ISP) in Africa intended to foment a Green Revolution. We find that this temporary subsidy for Mozambican maize farmers stimulates Green Revolution technology adoption and leads to increased maize yields. Effects of the subsidy persist in later unsubsidized years. In addition, social networks of subsidized farmers benefit from spillovers, experiencing increases in technology adoption, yields, and beliefs about the returns to the technologies. Spillovers account for the vast majority of subsidy-induced gains. ISPs alleviate informational market failures, stimulating learning about new technologies by subsidy recipients and their social networks. (JEL O13, Q12, Q16, Q18)

中文翻译：

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补贴和非洲绿色革命：莫桑比克随机投入补贴的直接影响和社会网络溢出

始于 1960 年代的绿色革命提高了亚洲和拉丁美洲的农业产量和经济福祉，但在很大程度上绕过了撒哈拉以南非洲地区。我们研究了非洲政府实施的投入补贴计划 (ISP) 的第一项随机对照试验，旨在推动绿色革命。我们发现，对莫桑比克玉米农民的这种临时补贴刺激了绿色革命技术的采用，并导致玉米产量增加。补贴的影响在后来的无补贴年份持续存在。此外，受补贴农民的社交网络受益于溢出效应，技术采用率、产量和对技术回报的信念都在增加。溢出效应占补贴带来的收益的绝大部分。ISP 缓解信息市场失灵，鼓励补贴接受者及其社交网络学习新技术。(JEL O13、Q12、Q16、Q18)