Network structure,portfolio diversification and systemic risk

We investigate the effect of portfolio diversification on banking systemic risk, where the network effect is incorporated. We analyze three kinds of interbank networks, namely, random networks, small-world networks and scale-free networks. We show that the effect of portfolio diversification on banking systemic risk depends on interbank network structures and shock types. First, systemic risk increases first and then reduces with the increase of the level of portfolio diversification in the case of the individual shock. Second, in the case of the systemic shock, systemic risk reduces with the increases of the level of portfolio diversification. Third, banking systems with scale-free network structures are the most stable, and those with small-world network structures are the most vulnerable.     

The Effects of Search-Related and Purchase-Related Mobile App Additions on Retailers’ Shareholder Wealth: The Roles of Firm Size,Product Category,and Customer Segment

Mobile channel additions have been shown to increase consumer-brand relationships, brand satisfaction towards and overall purchasing from a retailer, but what is less apparent is whether shareholders are fully rewarded for retailers’ mobile channel additions. Results from an event study on 115 announcements relating to mobile app additions of publicly traded U.S. retail firms between 2009 and 2016 indicate that the stock market responds generally positively to mobile app additions, but specifically to the two mobile app addition types. Stock market responses to search-related and purchase-related app additions are moderated by firm size, product category, and target customer age. For announcements of search-related apps, the market responds more positively to product retailers than to service retailers, and to small firms than large ones. For announcements of purchase-related apps, the market responds less positively to firms that target younger customers than firms who do not especially target them.     

卫星通信地球站终端技术的发展

本文介绍了卫星通信地球站终端技术的发展过程,初步论述了新技术应用的环境,为今后研制卫星通信设备提供某些参考。     

Form, function, and finance: architecture and finance theory

At least at first glance, a bank’s customers ought to be concerned with only one thing—the price they must pay for the services they receive. Architecture beyond the merely functional ought to have no role, especially not in the modern global economy in which increasingly automated financial intermediation of all sorts appears to be approaching the ideals of pure competition and perfect efficiency. Even in these financially sophisticated times, however, symbols matter, and the message communicated by these symbols is one which cannot be communicated in any other way. It is necessary for a financial institution, and perhaps even the financial system itself, to have a strong visual presence. There is a visceral appeal of an architecturally distinguished building to the senses that speaks to us in a way that the cerebral appeal of pure information cannot.     

‘Double marginalization’ problems: evidence from the Korean fixed-to-mobile service market

In this paper, examination of the possibility of a ‘double marginalization’ problem existing in the Korean telecommunication industry is conducted and suggestions are made for the provision of a new scheme to eliminate this possibility by changing the pricing system for fixed-to-mobile calls. Based on five key economic characteristics in the Korean mobile market, a simple model for double marginalization in the telecommunication market is introduced. Evidence was found to suggest that a double marginalization problem is likely to exist within Korea's telecommunication industry as it is presently structured, and that this problem is further likely to have an adverse effect on the industry by inflating the price of fixed-to-mobile calls. Two alternatives are proposed to effectively remedy this double marginalization issue. It is also shown that prices of fixed-to-mobile calls could be lowered by changing the caller pays principle into a receiver pays principle.     

自适应调制与编码系统及其在WCDMA中的应用

本文主要讨论自适应调制与编码系统(Adaptive Modulation and Coding system）的原理，介绍AMCS实现的几个关键技术，包括RCPT（速率适配凿孔turbo）码、高阶调制、H-ARQ和MIMO（多输入多输出）系统。介绍了在WCDMA的高速下行分组接入业务（HSDPA）中使用的自适应调制编码机制，并讨论了可能增加的设备复杂度。     

MEASURING THE OPERATIONAL EFFICIENCY OF COMMERCIAL BANKS IN NAMIBIA

This paper examines the efficiency of commercial banks in Namibia using the standard econometric frontier approach. Although two aspects of efficiency (scale and scope) receive our attention, the emphasis is on the latter which pertains to whether a firm produces as efficiently as it possibly can, given its size. Our results indicate that substantial economies of scale exist in commercial banking in Namibia. This will tend to suggest that commercial banks in Namibia can increase their efficiency by increasing their current scale of operation. The results for scope economies show that the current level of input combination does not make for maximum efficiency as sufficient scope exists for a more efficient combination of inputs. We believe this will reduce operating costs in the industry and stimulate efficiency.     

The market’s view on the probability of banking sector failure: cross-country comparisons

Hall and Miles (1990) suggest an approach of estimating default probabilities of banks using stock market information, and in this paper we apply an aggregated version of their approach to banking sectors around the world in both developed and emerging economies. We study the market’s assessment of the probability of systemic banking crises world wide over the last decade, including the Asian crisis 1997–1998. In addition, we investigate whether there is a relationship between the failure probability and institutional features of the actual banking sector. The quality of governance and the degree of law and order in a country is found to be significantly negatively related to the market based failure probabilities as is an explicit deposit insurance during periods of crisis.     

中国移动（香港）并购融资安排及其启示

并购活动需要大量资金支持,融资难已成为制约大规模战略并购的瓶颈之一.本文基于并购融资安排理论,通过对中国移动(香港)有限公司一系列并购融资安排的详细描述、统计、分析,揭示了中国移动(香港)并购融资的一些规律,从而说明企业应根据自身实际情况选择不同的并购融资安排,这对我国上市公司并购活动的融资安排具有重要的借鉴意义.     

移动支付对中国家庭储蓄率的影响

中国的高储蓄问题由来已久,降低家庭储蓄率、提高消费有助于形成以国内大循环为主体、国内国际双循环相互促进的新发展格局。本文基于2017年和2019年中国家庭金融调查(CHFS)数据,实证研究了移动支付对中国家庭储蓄率的影响。结果表明,移动支付显著降低了家庭储蓄率。进一步研究发现,缓解流动性约束、信贷约束和扩大社会网络是移动支付降低家庭储蓄率的主要途径。此外,移动支付显著降低家庭为应对健康风险、医疗风险、失业风险、收入风险等不确定性而进行的预防性储蓄。地区异质性分析显示,移动支付对家庭储蓄率的影响在西部地区、四五线城市、农村地区更大。家庭特征异质性分析显示,移动支付对家庭储蓄率的影响在农业户口家庭、中低收入家庭、低受教育水平家庭中效果更加突出。本文研究为理解中国高储蓄问题提供了新的视角,可为制定相关政策提供参考依据。