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排序方式: 共有60条查询结果,搜索用时 62 毫秒
1.
Leah Greden Mathews 《Review of Agricultural Economics》2002,24(2):528-539
This decision case is intended to provide an example of the complexity of local government decision making on the rural–urban fringe. In this case, a county is faced with making a decision about outlawing the existence of junk cars on personal property. Instructors can use this case to introduce topics such as zoning, takings, property rights, local government policy making, and the impact of the community on government decisions. Other issues could be explored, such as the role of culture and stereotypes in policy making, and how growth can impact local culture and lifestyle. 相似文献
2.
This paper proposes an approach to the intraday analysis of diversified world stock accumulation indices. The growth optimal portfolio (GOP) is used as reference unit or benchmark in a continuous financial market model. Diversified portfolios, covering the world stock market, are constructed and shown to approximate the GOP, providing the basis for a range of financial applications. The normalized GOP is modeled as a time transformed square root process of dimension four. Its dynamics are empirically verified for several world stock indices. Furthermore, the evolution of the transformed time is modeled as the integral over a rapidly evolving mean-reverting market activity process with deterministic volatility. The empirical findings suggest a rather simple and robust model for a world stock index that reflects the historical evolution, by using only a few readily observable parameters.
Mathematics Subject Classification: (1991) primary 90A12, secondary 60G30,62P20
JEL Classification: G10, G13 相似文献
3.
The impact of conservation tillage on maize yield and input demand: the case of smallholder farmers in north‐west Ethiopia
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Yohannis Mulu Tessema John Asafu‐Adjaye Bekele Shiferaw 《The Australian journal of agricultural and resource economics》2018,62(4):636-653
This study analyses the economics of conservation tillage (CT) with respect to its effect on maize yield and chemical fertiliser, herbicide, and female and male labour demand. We estimate production and input demand functions using seemingly unrelated regressions on plot‐level cross‐sectional farm household data collected in the north‐west of Ethiopia. A two‐step control function is applied to address potential endogeneity bias due to the inclusion of the CT adoption decision as an explanatory variable. Our results show that CT increases maize yield and chemical fertiliser demand. Additionally, the results show that the adoption of CT reduces female and male labour required for crop production. However, this is achieved through the increased use of herbicides, which might have an undesirable health and environmental effects. 相似文献
4.
Resource degradation and adoption of land conservation technologies in the Ethiopian Highlands: A case study in Andit Tid,North Shewa 总被引:2,自引:0,他引:2
This paper reports results from a study of resource degradation and conservation behavior of peasant households in a degraded part of the Ethiopian highlands. Peasant households' choice of conservation technologies is modeled as a two-stage process: recognition of the erosion problem, and adoption and level of use of control practices. An ordinal logit model is used to explain parcel-level perception of the threat of the erosion problem and the extent of use of conservation practices. Results show the importance of perception of the threat of soil erosion, household, land and farm characteristics; perception of technology-specific attributes, and land quality differentials in shaping conservation decisions of peasants. Furthermore, where poverty is widespread and appropriate support policies are lacking, results indicate that population pressure per se is unable to encourage sustainable land use. The challenge of breaking the poverty-environment trap and initiating sustainable intensification thus require policy incentives and technologies that confer short-term benefits to the poor while conserving the resource base. 相似文献
5.
Kate Fuller Mahri Monson Jennifer Ward Leah Greden Mathews 《Review of Agricultural Economics》2005,27(4):621-629
The conditions that lead to successful economic development are diverse and place sensitive. Recent research supports the notion that there is a correlation between the presence of natural amenities and rural economic development. This case explores the situation of a rural county that is faced with constrained development options as a result of a significant federal footprint on the county's land area. The actions of the federal agencies managing the resources impact the economic vitality of the region. Two issues currently under review challenge the county to think critically about its potential for using nature as an economic development tool. 相似文献
6.
The compliance model of employment standards enforcement: an evidence‐based assessment of its efficacy in instances of wage theft
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Leah F. Vosko John Grundy Eric Tucker Mark P. Thomas Andrea M. Noack Rebecca Casey Mary Gellatly Jennifer Mussell 《Industrial Relations Journal》2017,48(3):256-273
This article critically assesses the compliance model of employment standards enforcement through a study of monetary employment standards violations in Ontario, Canada. The findings suggest that, in contexts where changes to the organisation of work deepen insecurity for employees, models of enforcement that emphasise compliance over deterrence are unlikely to effectively prevent or remedy employment standards violations. 相似文献
7.
Using panel household survey data from rural Ethiopia, we investigate informal risk sharing against health shocks in the presence of multiple risk sharing networks. We find that neither short‐term nor long‐term health shocks are insured through transfers from networks such as friends, neighbors, and members of informal associations. However, networks related along bloodline such as extended family members provide assistance when health shocks are long‐term such as disabilities. The results show that these networks strategically complement planned component of their transfers which are made on a regular basis such as remittance, entitlement, or chop money (small cash sums for household expenses). Moreover, we find significant history dependence in transfers from not only genetically distant networks but also extended family members as well as formal institutions, which seems to discourage dependency. Finally, the findings suggest significant heterogeneity in transfers. 相似文献
8.
Policy instruments for sustainable land management: the case of highland smallholders in Ethiopia 总被引:6,自引:0,他引:6
Degradation of land continues to pose a threat to future food production potential in many developing economies. Various approaches, mainly based on command‐and‐control policies, have been tried (with limited success) in the past to encourage adoption of erosion‐control practices by farm households. High transactions costs and negative distributional impacts on the welfare of the poor limit the usefulness of standards and taxes for soil and water conservation. One innovative approach is the use of interlinked contracts which create positive incentives for land conservation. This study analyses the social efficiency of such policies for erosion‐control in the Ethiopian highlands using a non‐separable farm household model. Incentive contracts linked with conservation seem to be promising approaches for sustainable resource use in poor rural economies. This may suggest that conservation programs should give greater consideration to better fine‐tuning and mix of policies that help achieve both economic and environmental objectives. 相似文献
9.
Does when a child was born relative to his or her siblings affect whether the child attends school or participates in child labour? We investigate this question by estimating the causal effect of birth order on the probabilities of school attendance and child labour participation. To address the potential endogeneity of family size, we use instrumental variable approach where the proportion of boys in the family is used to instrument family size. Using a longitudinal household survey data from Ethiopia, we estimate unobserved effects bivariate probit instrumental variable model of school attendance and child labour choices. The results suggest that the probability of child labour participation decreases with birth order, but we find no evidence that suggests birth order affects the probability of school attendance. However, among children who are going to school, hours spent studying increases with birth order. Results from complementary time-use analysis reveal that there is no birth order effect on hours spent on household chore. However, hours spent on school increases with birth order, where the increase in hours spent on school seems to come from a decrease in hours spent on market work. 相似文献
10.
Hailemariam Teklewold Menale Kassie Bekele Shiferaw 《Journal of Agricultural Economics》2013,64(3):597-623
The adoption and diffusion of sustainable agricultural practices (SAPs) has become an important issue in the development‐policy agenda for sub‐Saharan Africa, especially as a way to tackle land degradation, low agricultural productivity and poverty. However, the adoption rates of SAPs remain below expected levels. This study analyses the factors that facilitate or impede the probability and level of adoption of interrelated SAPs, using recent data from multiple plot‐level observations in rural Ethiopia. Multivariate and ordered probit models are applied to the modelling of adoption decisions by farm households facing multiple SAPs, which can be adopted in various combinations. The results show that there is a significant correlation between SAPs, suggesting that adoptions of SAPs are interrelated. The analysis further shows that both the probability and the extent of adoption of SAPs are influenced by many factors: a household’s trust in government support, credit constraints, spouse education, rainfall and plot‐level disturbances, household wealth, social capital and networks, labour availability, plot and market access. These results imply that policy‐makers and development practitioners should seek to strengthen local institutions and service providers, maintain or increase household asset bases and establish and strengthen social protection schemes in order to improve the adoption of SAPs. 相似文献