精挑细选的农作物：村域经济中的农业实践与聚类网络
The Pick of the Crop: Agricultural Practices and Clustered Networks in Village Economies
Journal of the European Economic Association · 2025 · [{"name": "André Gröger", "affiliation": ["Universitat Autònoma de Barcelona"]}, {"name": "Yanos Zylberberg", "affiliation": ["University of Bristol"]}]
中文摘要
摘要 本文研究社会网络如何塑造（或可能未能塑造）农业实践。我们利用（1）嵌套于划定地块内的一份独特的农业生产普查数据，以及（2）越南农村四个重新定居村庄内的社会网络数据。第一步，我们从构成每个村庄的少数几条街道内的住房位置中提取网络形成的外生变异（这些村庄通过交错（分批）人口重新安置而形成），并估计社会联系在采用高生产率作物中的回报。我们发现了很大的网络乘数，这表面上与较低的采用率相矛盾。第二步，我们研究网络形成的结构以解释这一谜题：社会网络表现出很强的同质性，异质家庭之间有价值的联系较为稀少。由于网络的聚类性质以及农业实践的动态、内生传播，社会联系存在递减回报，而针对“中间人”的政策最能缓解这一问题。
Abstract
Abstract This paper studies how social networks (might fail to) shape agricultural practices. We exploit (1) a unique census of agricultural production nested within delineated land parcels and (2) social network data within four repopulated villages of rural Vietnam. In the first step, we extract exogenous variation in network formation from home locations within the few streets that compose each village (populated through staggered population resettlement), and we estimate the return to social links in the adoption of highly productive crops. We find a large network multiplier in apparent contradiction with low adoption rates. In the second step, we study the structure of network formation to explain this puzzle: Social networks display large homophily, and valuable links between heterogeneous households are rare. Due to the clustered nature of networks and the dynamic, endogenous propagation of agricultural practices, there are decreasing returns to social links, and policies targeting “inbetweeners” are most able to mitigate this issue.