Population pressure, intensification of agriculture, and rural-urban migration.
"In this paper I provide an analytical basis for why labor absorption [in agriculture] may improve with higher population density.  My argument is in two parts.  First, analysing agriculture in isolation, I use the Boserup insight to show that higher population density is associated with more intensive techniques of land use.  Second, using a two-sector model, I show that the rate of labor absorption (defined as the rate of natural population growth minus the rate of rural-urban migration) increases with the intensity of land use."  Cross-sectional data for Iran are used to illustrate the model.
D000383:Agriculture; D001208:Asia; D003247:Conservation of Natural Resources; D003710:Demography; D003906:Developing Countries; D004467:Economics; D004641:Emigration and Immigration; D004651:Employment; D004777:Environment; D005843:Geography; D006280:Health Workforce; D007492:Iran; D011153:Population; D011154:Population Characteristics; D011156:Population Density; D011157:Population Dynamics; D012424:Rural Population; D012939:Social Planning; D012959:Socioeconomic Factors; D014171:Transients and Migrants
Agricultural Development; Asia; Demographic Factors; Developing Countries; Economic Factors; Environment; Geographic Factors; Human Resources; Iran; Labor Force; Labor Migration; Land Supply; Land Tenure; Migration; Natural Resources; Population; Population Characteristics; Population Density; Population Dynamics; Rural Development; Rural Population; Rural-urban Migration; Socioeconomic Factors; Southern Asia; Spatial Distribution