“一带一路”倡议下中国口岸出入境货运量的时空格局演变探究

口岸作为国家指定的对外开放门户,承担着国与国之间货物运输和人员往来的重要功能。"一带一路"倡议的实施促进了我国口岸的发展,带动了口岸经济与区域经济的发展,反过来进一步加强了与"一带一路"沿线国家的合作。本文利用口岸运行指标中的出入境货运量数据,借助探索性空间数据分析方法,对我国2011—2017年31个省(区、市)的口岸出入境货运量的时空格局进行分析。结果表明:"一带一路"倡议提出后,尤其是2015年后,我国口岸出入境货运总量呈现快速增长态势且存在显著的空间正相关性;三类口岸(水运、陆运和空运口岸)中,水运口岸存在更显著的、更强的空间相关性;各类口岸出入境货运量中,东部沿海地区水运呈现正向空间集聚现象,西部沿边地区陆运呈现极化现象。此外,本文对全国31个省(区、市)的地区货运总量也进行了空间动态分析,发现也存在空间相关性,且集聚效应在"一带一路"倡议提出后不断增强。在此基础上,为了更好地服务于"一带一路"建设,本文提出了提升各类口岸运输能力的相关对策建议。     

联产品协同生产的成本驱动实证研究

实证研究证明，联产品生产的协同作用也是产品成本的驱动因素。协同成本的动因在于联产品的组成变量。在联产品协同生产过程中，所采取的基于非线性成本函数的边际成本计算法，应该是数理依据严谨、实务应用可行的方法。     

Real estate return correlations: Real-world limitations on relationships inferred from NCREIF data

Correlation estimates for returns between individual properties are subject to large inherent uncertainties due to limits on the amount of data that is likely to be available for the foreseeable future. After allowance for correlation sampling error, it is impossible to distinguish on an ex ante basis between the risk-reduction capabilities of mean-variance portfolio selection models and naive diversification without regard to property type or geographical location. The naive portfolio diversification strategies of typical institutional real estate portfolio managers are rational responses to limitations on the informational content of statistical analyses of historical real estate data.     

基于灰色关联分析的施工方案优选研究

施工方案的选择不仅直接影响项目利润的大小，更会关系到项目的成功与失败。本文在充分考虑施工方案影响因素的基础上，选择施工方案评价指标，利用层次分析法确定各评价指标的权重。建立灰色关联分析模型，构造理想方案。在分析各拟选施工方案与理想方案关联度的基础上确定最优方案，并结合实例进行了阐述。     

企业主体性产权理论的构建 --相关和自主统一的属性所有权

企业是市场经济活动的主体，应该具有其主体属性，并且正是其主体属性决定它的主体地位和作用，并形成主体性产权。但是，学术界缺乏对这个问题的研究，主要是因为受西方经济学传统的限制，要突破这种限制必须把经济学与管理学结合起来进行研究，以构建企业主体性产权理论。企业主体性产权是其相关属性产权与自主属性产权的统一。企业相关属性及其产权是基础和结果，主要说明企业主体性产权的共性；企业自主属性及其产权是原动力和境界，主要说明企业主体性产权的个性。它们的互补和统一突出地体现在企业家及其产权上。企业主体性产权的目的是在防止“蛋糕”缩小的同时把“蛋糕”做大，其核心是基于相互关系的约束而进行自主创造的激励，其模型的运行特点是协同一自主创造。企业主体性产权理论的应用，可以保证和促使中国企业循着超越自然历史发展。     

财政教育支出的农村减贫效应研究——基于网络空间结构的分析

运用修正的引力模型测算出我国财政教育支出的空间关联关系,以及财政教育支出对农村减贫的空间关联影响效应。实证结果表明：我国财政教育支出在空间关联上呈现出复杂、多线程的网络结构;区域间财政教育支出差异和人力资本差异与农村贫困联动矩阵呈现显著负相关,区域间技术发展水平差异和经济发展水平差异与农村贫困联动矩阵呈现显著正相关。加强我国农村贫困的治理,需要考虑财政教育支出的空间关联作用,实施定向的、梯度推进的区域协同策略。     

农村普惠金融发展空间差异与集聚效应

基于中国农村普惠金融发展的空间地理特征,依据2006-2015年30个省市相关数据,测算农村普惠金融水平;建立空间自回归模型(SLM)和空间误差模型(SEM)检验普惠金融发展空间集聚效应.结果发现:各省市农村普惠金融指数总体呈上升趋势,农村普惠金融发展空间相关性逐年增强,局部空间差异逐渐缩小.普惠金融集聚与农民收入变化之间存在正空间相关性,普惠金融水平的提高能够促进农民收入水平的提高.鉴此,应加强区域空间金融合作,提高保险业普惠度;加强地方政府之间交流合作,发挥普惠金融集聚辐射作用,推动农民收入水平进一步提高.     

Optimizing the credit term decisions in supply chain finance

We study a credit term determination problem in the context of a supplier-buyer supply chain. The supplier's credit term decision is simultaneously made with its production and inventory decisions, and most importantly, it is impacted by the buyer's order quantity. We present a new game-theoretic framework to model this problem, which captures the interaction between the supplier's credit term decision and the buyer's order decision in a multi-period setting. An exact method based on nonlinear programming is implemented to obtain the optimal solutions. We apply our methodologies on a real world case. The computational results show that our approach significantly outperforms the heuristics with fixed credit terms, and either a short or a long credit term can be sub-optimal for the supplier in profitability. Our work offers the first data-driven model and solution approach that assists purchasing and supply managers to make optimal dynamic credit term decision in conjunction with production, ordering and inventory decisions in a game-theoretic setting.     

Solvability of perturbation solutions in DSGE models

We prove that the undetermined Taylor series coefficients of local approximations to the policy function of arbitrary order in a wide class of discrete time dynamic stochastic general equilibrium (DSGE) models are solvable by standard DSGE perturbation methods under regularity and saddle point stability assumptions on first order approximations. Extending the approach to nonstationary models, we provide necessary and sufficient conditions for solvability, as well as an example in the neoclassical growth model where solvability fails. Finally, we eliminate the assumption of solvability needed for the local existence theorem of perturbation solutions, complete the proof that the policy function is invariant to first order changes in risk, and attribute the loss of numerical accuracy in progressively higher order terms to the compounding of errors from the first order transition matrix.