价补分离政策下农户的玉米种植行为研究基于吉林省宏观与微观数据分析

[目的]通过对价补分离政策实施前后吉林省玉米种植相关数据的分析,初步了解政策对农户种植行为产生的影响,进而探索吉林省农户在价补分离政策实施的第3年其玉米种植行为所受的主要影响因素。[方法]文章以吉林省玉米种植农户为研究对象,基于宏观与微观数据,采用多元Logistic模型分析农户玉米种植行为与政策之间的关系。[结果]价补分离政策改变吉林省农户的玉米种植行为。因价补分离政策实施导致的玉米价格下跌造成单位面积收益降低时,农户会寻求其他单位面积收益更高的作物,进而调整种植行为。[结论]玉米生产者补贴的发放对农户玉米种植行为调整具有引导作用。玉米优势产区与非优势产区的农户对价补分离政策不同的种植行为响应验证价补分离政策在保障粮食安全的同时调减玉米非优势产区玉米种植的作用。同时政策在实施过程中存在农户理解不到位及滞后性问题,因此从完善价补分离政策并提高农户对政策的认知程度等方面提出建议以更好地实现在调整玉米种植结构的同时稳定农户收入的政策目标。     

The distributional impact of public services when needs differ

Despite a broad consensus on the need to take into account the value of public services in distributional analysis, there is little reliable evidence on how inclusion of such non-cash income actually affects poverty and inequality estimates. In particular, the equivalence scales applied to cash income are not necessarily appropriate when including non-cash income, because the receipt of public services is likely to be associated with particular needs. In this paper, we propose a theory-based framework designed to provide a coherent evaluation of the distributional impact of local public services. The valuation of public services, identification of target groups, allocation of expenditures to target groups, and adjustment for differences in needs are derived from a model of local government spending behaviour. Using Norwegian data from municipal accounts and administrative registers we find that the inclusion of non-cash income reduces income inequality by about 15% and poverty rates by almost one-third. However, adjusting for differences in needs for public services across population subgroups offsets about half the inequality reduction and some of the poverty decrease.     

Recovering Risky Technologies Using the Almost Ideal Demand System: An Application to U.S. Banking

We present and estimate a model that shifts the focus of modeling production from the traditional assumptions of profit maximization and cost minimization to a more general assumption of managerial utility maximization that can incorporate risk incentives into the analysis of production and recover value-maximizing technologies. We implement the model using the almost ideal demand system. In addition, we use the model to measure efficiency in a more general way that can incorporate a concern for the market value of firms assets and equity and identify value-maximizing firms. This shift in focus bridges the gap between the risk incentives literature in banking that ignores the microeconomics of production and the production literature that ignores the relationship between production decisions and risk. Our estimation of the model for a sample of U.S. commercial banks illustrates that results obtained from our generalized model can differ significantly from those obtained from the standard profit-maximization model, which ignores risk.     

Renaissance attachment to things: material culture in last wills and testaments1

Over the past decade ‘material culture’ has become a sub‐discipline of Italian Renaissance studies. This literature, however, has focused on the rich and their objects preserved in museums or reflected in paintings. In addition, the period 1300 to 1600 has been treated without attention to changes in the relationship between people and possessions. The article turns to last wills and testaments, which survive in great numbers and sink deep roots through late medieval and Renaissance cities and their hinterlands. They reveal aspirations and anxieties about things from post‐mortem repairs to farm houses to pillows of monk's wool. These aspirations changed fundamentally after the Black Death. Earlier, during the ‘commercial revolution’, ordinary merchants, artisans, and peasants on their deathbeds practised what the mendicants preached: stripping themselves of their possessions, they converted their estates to coin to be scattered among pious and non‐pious beneficiaries. After the Black Death, testators began to reverse tack, devising ever more complex legal strategies to govern the future flow of their goods. This work of the dead had larger economic consequences. By encouraging the liquidation of estates, the earlier mendicant ideology quickened the velocity of exchange, while the early Renaissance attachment to things did the opposite.     

我国城乡一体化改革的法制保障

在我国, "城乡一体化"观念大约出现于20世纪80年代末.对于什么是城乡一体化,不同学科有不同界定.法学视角中的城乡一体化是指通过制度变革和渐进过程,打破并最终消除城乡二元结构的壁垒,使农村与城市获得平等的发展机会,使农民与市民享有平等权利,享受平等的物质文明、政治文明和精神文明.     

Generalized linear mixed models with informative dropouts and missing covariates

Generalized linear mixed models (GLMM) are useful in many longitudinal data analyses. In the presence of informative dropouts and missing covariates, however, standard complete-data methods may not be applicable. In this article, we consider a likelihood method and an approximate method for GLMM with informative dropouts and missing covariates. The methods are implemented by Monte–Carlo EM algorithms combined with Gibbs sampler. The approximate method may lead to inconsistent estimators but is computationally more efficient than the likelihood method. The two methods are evaluated via a simulation study for longitudinal binary data, and appear to perform reasonably well. A dataset on mental distress is analyzed in details.     

滨海新区形成高层次服务产业结构的路径选择

滨海新区欲做到高起点、高层次、高水平发展关键在于充分认识现代服务业在城市经济发展中揪的主导作用,着力构筑高层次产业结构,突显现代服务业的主导地位,选择能够充分发挥后发优势的加快发展现代服务业的路径.