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α: calibrated so average coauthorship-adjusted count equals average raw count
A common element revealed by comparative history of four Asian countries is a major shift in the momentum of agricultural growth from an extension of cultivation frontiers to an agricultural system that uses land more intensively. Improvements in land infrastructure, such as irrigation and drainage, are identified as preconditions for the development of land-saving farming technology. Public investments in land infrastructure were induced by the higher rates of return to irrigation construction and improvements than to new land opening.