This research advances the hypothesis that natural land productivity in the past, and its effect on the desirable level of cooperation in the agricultural sector, had a persistent effect on the evolution of social capital, the process of industrialization and comparative economic development across the globe. Exploiting exogenous sources of variations in land productivity across (a) countries; (b) individuals within a country, (c) migrants of different ancestry within a country, and (d) individuals residing in regions within a country, the research establishes that lower level of land productivity in the past is associated with more intense cooperation and higher levels of contemporary social capital and development.

中文翻译：

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自然土地生产力，合作与比较发展

这项研究提出了这样一种假设，即过去的自然土地生产力及其对农业部门合意合作水平的影响，对全球社会资本的演变，工业化进程和比较经济发展具有持续影响。在（a）个国家中利用土地生产力差异的外源；（b）一个国家内的个人，（c）一个国家内不同血统的移民，以及（d）居住在一个国家内区域的个人，研究发现，过去较低的土地生产力与更紧密的合作和更高水平的当代社会资本与发展。