U.S. Agricultural Labor Out-migration Determinants, 1939-2004

Replaced with revised version of paper 06/01/06.Labor and Human Capital,

Marketing in Online Businesses:The Case of Migrant Entrepreneurial Businesses in the UK

The study presents an empirical investigation of the marketing activities undertaken by online businesses owned by migrant entrepreneurs and is framed by the theoretical lens of entrepreneurial marketing. Key informant interviews are undertaken with 22 entrepreneurs operating online businesses in the UK and augmented by other sources of data. The study finds that the resources available to the entrepreneurs are shaped by their migrant heritage and that they draw on these resources to market their online businesses. The study also finds that, consistent with notions from entrepreneurial marketing, the online nature of their businesses allow the entrepreneurs to meet their own needs and preferences, which are also shaped by their migrant heritage. The study is important since it provides empirical evidence and a theoretically grounded understanding of how online businesses offer migrant entrepreneurs the opportunity to break out of the low growth, low margin, vacancy chain openings and enter high growth, high margin, post-industrial sectors

Migration, Money and Mother: The Effect of Migration on Children's Educational Performance in Rural China

Migration is widely known as one of the main ways of alleviating poverty in developing countries, including China. However, migration itself is not costless. In recent years, there is an emerging concern about the effect of migration on the educational achievement of the children of migrants in China since most of the young children of school age of the migrants are being left in the village when one or both of their parents move to the city to work. This paper examines the effect of the migration activities of the father and/or mother on the educational performance of elementary school students (First to Fifth grade). With a dataset that collected from a survey designed specifically to examine changes in school performance of children before and after their parents left the village to migrate to the city we use Difference-in-Difference and, propensity score matching approaches. Although the grades of the children from some migrants family are sometimes lower than those from non-migrants family (in the time period before and after migration), somewhat surprisingly, we find that there is no significant negative effect of migration itself on the childrens school performance. In fact, in some cases (e.g., after the father migrates), performance improves. Our paper also demonstrates and explains the interaction effects of migration from wealth and household composition.Labor and Human Capital,

Numerical simulations of the impacts of mountain on oasis effects in arid Central Asia

The oases in the mountain-basin systems of Central Asia are extremely fragile. Investigating oasis effects and oasis-desert interactions is important for understanding the ecological stability of oases. However, previous studies have been performed only in oasis-desert environments and have not considered the impacts of mountains. In this study, oasis effects were explored in the context of mountain effects in the northern Tianshan Mountains (NTM) using the Weather Research and Forecasting (WRF) model. Four numerical simulations are performed. The def simulation uses the default terrestrial datasets provided by the WRF model. The mod simulation uses actual terrestrial datasets from satellite products. The non-oasis simulation is a scenario simulation in which oasis areas are replaced by desert conditions, while all other conditions are the same as the mod simulation. Finally, the non-mountain simulation is a scenario simulation in which the elevation values of all grids are set to a constant value of 300 m, while all other conditions are the same as in the mod simulation. The mod simulation agrees well with near-surface measurements of temperature, relative humidity and latent heat flux. The Tianshan Mountains exert a cooling and wetting effects in the NTM region. The oasis breeze circulation (OBC) between oases and the deserts is counteracted by the stronger background circulation. Thus, the self-supporting mechanism of oases originating from the OBC plays a limited role in maintaining the ecological stability of oases in this mountain-basin system. However, the mountain wind causes the cold-wet'' island effects of the oases to extend into the oasis-desert transition zone at night, which is beneficial for plants in the transition region