新闻职业伦理四大争议问题评析

本文基于伦理和道德问题的分殊,重点探究当代新闻伦理四个基本问题。本文认为,在当今的全球化时代,许多社会基本问题充满了伦理争议,对于深刻影响社会的新闻传播职业来说,情况尤其是如此。如果说人们对于虚构造假、漠视生命等新闻职业道德问题通常可以明辨是非的话,那么新闻传播职业伦理问题则复杂得多,而且即便经过百家争鸣式的讨论,也难以求得一致意见。但是,我们通过这种以反思批判为特征的讨论,至少可以建立这样的共识:伦理思考和争论是一种极好的思维和表达训练,它对新闻从业者个人人格的完善、职业伦理以及公共伦理的养成和发展都是至关重要的。     

Limited Information and Advertising in the U.S. Personal Computer Industry

Traditional discrete‐choice models assume buyers are aware of all products for sale. In markets where products change rapidly, the full information assumption is untenable. I present a discrete‐choice model of limited consumer information, where advertising influences the set of products from which consumers choose to purchase. I apply the model to the U.S. personal computer market where top firms spend over $2 billion annually on advertising. I find estimated markups of 19% over production costs, where top firms advertise more than average and earn higher than average markups. High markups are explained to a large extent by informational asymmetries across consumers, where full information models predict markups of one‐fourth the magnitude. I find that estimated product demand curves are biased toward being too elastic under traditional models. I show how to use data on media exposure to improve estimated price elasticities in the absence of micro ad data.     

利率期限结构预测、国债定价及国债组合管理

国债利率期限结构是固定收益产品定价和投资组合管理的核心问题。本文利用NARX（Nonlinear AutoRegressive network with eXogenous inputs）神经网络模型研究利率曲线的运动机制,拟合并预测利率期限结构,在此基础上利用Hermite插值方法构造平滑的利率曲线并计算得到国债理论价格及其预测值。实证分析发现我国国债定价效率不足,交易价格显著偏离理论价格,但国债的理论价格的实际值和预测值均对交易价格具有显著的预测能力。基于上述发现本文提出了主动国债组合管理策略,通过预测的期限结构得到国债理论价格的预测值构建的多空对冲组合和单边多头组合均能获得显著的收益。本文的研究丰富了利率期限结构的研究方法,提出的主动国债组合管理策略对通过交易提高国债定价有效性具有参考价值。     

住房价格、土地价格与地方政府行为

本文基于中国35个大中城市2005至2015年的面板数据,通过构建具有“空间依赖”性质的房价地价空间面板联立方程模型,深入研究房价与地价关系、地方政府行为对房价和地价的作用机制以及城际间的相互作用。研究表明,临近城市间的房价相互“模仿”并一同推动地价上涨,房价对地价的影响呈现“模仿促进”的作用特征;各城市通过尽可能抬高本地地价来拉大与临近城市地价水平的差距,进而推高房价,实现“以地生财”。此外,研究还证实地方政府通过“价格途径”和“政策途径”均能对房价进行有效调控,且“价格途径”具有一定的传染性;而“数量途径”和“结构途径”作为地方政府控制地价的有效手段,具有较强的溢出效应。     

The rise of Trump and an agenda for regulatory reform

The arrival of Trump in the White House does not augur well for the long-run prospects of the US economy. The protectionism that is gathering steam under his presidency may yield some short-term gains, but at the detriment of the long-run. Examining the discontent among ordinary voters that brought Trump to power, this paper argues that this should be treated as an opportunity for a major regulatory reform. With the advance of digital technology, we have increasing returns to scale, and that, in turn, is making our antitrust laws backfire and hurt the well-being of ordinary people, thereby sowing discontent. The paper builds a simple model to illustrate this and makes the case for revoking the older antitrust laws and replacing them with some simple profit-sharing rules at the level of the firm, and the economy.     

我国35个大中城市房价-持久收入比研究

房价收入比是反映居民购房可支付能力的重要指标。为了更真实准确反映我国居民长期承受的购房负担,本文基于持久收入假说,利用我国35个大中城市数据,建立状态空间模型,估计出持久收入意义下的房价收入比,通过情景分析确定其合理上限,并分析主要特征。研究表明：①我国房价-持久收入比的合理上限为7.6,2002-2013年35个大中城市的房价-持久收入比均值是9.2,其中28个城市已超过该上限,比值最高的北京已达到14.9;②城市越发达,则房价-持久收入比越高,居民需要承受的购房压力越大,且在时间趋势上,一线与二三线城市间的差距呈现扩大趋势;③在地理分布上,我国东部、中部、东北地区、西部大中城市的房价-持久收入比呈现从高到低的排列顺序;④相比于传统方法中根据可支配收入测算的房价收入比,房价-持久收入比与其约有10%的差异。当前我国政府应采取有效措施继续限制房价,减轻居民购房负担。     

住房价格应该纳入通货膨胀的统计范围吗？

 本文分别从度量生活成本和执行货币政策的角度研究住房价格是否应该纳入通货膨胀的统计范围。从度量生活成本的角度看,应该将住房价格纳入CPI的统计范围,然而本文的文献回顾表明,如何在CPI的统计框架下妥善处理住房价格仍然没有一致的结论。从执行货币政策的角度看,考虑到核心通货膨胀更适合作为货币政策的通货膨胀目标,本文研究了住房价格对核心通货膨胀的影响,发现住房价格对我国核心通货膨胀的影响微乎其微。这表明,如果稳定物价是货币政策的唯一目标,则货币政策无需考虑住房价格。然而,由于我国的货币政策需要兼顾多个目标且住房价格会显著影响产出水平,所以从稳定产出的角度看,货币政策仍须重视住房价格。     

租售比与房地产市场宏观调控

我国房地产业发展历程充满着关于房地产泡沫的争论。近年来,随着房价的上涨,这种争论持续升温。房地产泡沫一旦发生,将给国家的经济和社会生活带来严重的后果,因此,防范房地产泡沫的发生具有重要的现实意义。本文通过对我国房屋租售比现状的分析,指出了我国住宅销售价格过高,住宅需求更多地体现为投资和投机的需求,住房价格中存在着泡沫。在此基础之上,本文就我国房屋租售比失调的成因进行了简要的讨论,并针对房地产市场宏观调控提出了一系列建议。     

‘Getting by’: life on the Copperbelt after the privatisation of the Zambia Consolidated Copper Mines

The privatisation of the Zambian Consolidated Copper Mines (ZCCM) in 1997 resulted in massive job losses, which marked the beginning of an unprecedented economic crisis on the Copperbelt. This coincided with the initiation of a house ownership policy by the Chiluba administration. Miners thus lost a job and gained a house as part of their retrenchment packages, which included some cash. The harsh material and psychological realities experienced by miners in this transition period spurred a wide array of informal economic activities in which the house and yard played important economic roles. It also tinged the experiences of former mine employees with nostalgia for a ‘golden’ past where the mining system provided a stable economic base and a wide range of social services. The disappearance of the old ZCCM system and its de facto control on socio‐economic differentiation sparked new processes of ‘class’ formation. This paper describes the livelihood processes and experiences of former mine employees, focussing on a high‐cost mine neighbourhood in the Copperbelt town of Luanshya.     

单一出厂定价制度下区位假设与厂商选址决策

本文修改Hotelling（1929）模型的基本假定,假定厂商边际生产成本为正,交通成本由消费者负担,厂商区位可以为内生变量,也可以为外生变量,在此假定前提下,分析厂商的最优的区位一价格策略,以探讨最大差异化原则或者最小差异化原则何时成立,或者不成立。