高技术企业多元化战略对创新持续性的影响——动态能力的调节作用

基于资源基础理论和持续创新内生机制，利用435家高技术企业2010—2018年面板数据，对多元化战略对高技术企业创新持续性的影响进行探究。结果表明，产品多元化与创新持续性呈正U型关系，技术多元化对创新持续性具有正向促进作用，产品多元化与技术多元化协同效应对创新持续性具有负向影响；动态能力强化了产品多元化与创新持续性之间的正U型关系，并正向调节技术多元化与创新持续性之间的关系。在动态能力调节作用下，高技术企业产品多元化与技术多元化协同效应对创新持续性具有正向影响。     

Bank business models and liquidity creation

Using a large panel of US bank holding companies from 2001 to 2015, this study investigates the association between functional diversification and bank liquidity creation. I document evidence of lower liquidity creation for higher diversification. The effect of moving into nontraditional activities on liquidity creation is more apparent with large banks and less pronounced with small banks. The impact of diversification on liquidity creation is less significant during the late stage of crisis and is more clearly observed in small and medium-sized banks. Low liquidity creation banks, leveraged by a higher share of non-interest income, are more likely to further decrease their liquidity creation. The study is of interest to regulators and policymakers who are concerned about bank business models.     

Diversified behavioral portfolio as an alternative to Modern Portfolio Theory

The traditional mean–variance approach has been complemented by alternative theories that use risk measures different from standard deviation of returns or involve additional distributional features of returns like skewness and kurtosis. We propose a portfolio choice model that combines different distributional characteristics of the returns in the decision-making making process, considering preferences of investors which are modeled as non-statistical uncertainties of investors using fuzzy theory. We use 20 stocks of the S&P500 from January 2013 to December 2017. We assess the obtained portfolios’ performance, and the diversified behavioral portfolios outperform than the mean–variance portfolio. This methodological proposal can be seen as a strong managerial tool to make investment portfolio decisions.     

非互惠的零关税待遇是否促进了受惠国的出口多样化——基于中美对非洲贸易政策的比较研究

非互惠的优惠贸易待遇是世界贸易组织和国际社会支持发展中国家尤其是最不发达国家发展的重要工具。为了评估该政策的效果,本文以中美对非洲实施的零关税待遇为例,采用2001—2017年HS8位贸易数据从整体、行业和区域层面评估了两种政策对受惠国出口多样化产生的影响。结果显示,美国零关税待遇分为AGOA-GSP和AGOA-服装两个条款,中国零关税待遇(FOCAC)在遵循WTO规则、受惠商品范围、受惠国家标准、原产地标准及政策有效期方面均优于AGOA-GSP,但在原产地标准灵活度和政策优惠力度方面低于AGOA-服装。这些特征导致三类政策对受惠国出口多样化的影响产生显著的差异。整体上,FOCAC和AGOA-服装对受惠国出口多样化均产生了显著的积极影响,而AGOA-GSP的影响不显著;行业层面,FOCAC对受惠国制造业、矿业和农业的出口多样化均产生了显著的促进作用,而AGOA的两个条款对受惠国三个细分行业出口多样化的影响均不显著;区域层面,三类政策对受惠国出口多样化的影响仅在部分区域发挥效果。     

Maximizing an equity portfolio excess growth rate: a new form of smart beta strategy?

It has been claimed that, for dynamic investment strategies, the simple act of rebalancing a portfolio can be a source of additional performance, sometimes referred to as the volatility pumping effect or the diversification bonus because volatility and diversification turn out to be key drivers of the portfolio performance. Stochastic portfolio theory suggests that the portfolio excess growth rate, defined as the difference between the portfolio expected growth rate and the weighted-average expected growth rate of the assets in the portfolio, is an important component of this additional performance (see Fernholz [Stochastic Portfolio Theory, 2002 (Springer)]). In this context, one might wonder whether maximizing a portfolio excess growth rate would lead to an improvement in the portfolio performance or risk-adjusted performance. This paper provides a thorough empirical analysis of the maximization of an equity portfolio excess growth rate in a portfolio construction context for individual stocks. In out-of-sample empirical tests conducted on individual stocks from 4 different regions (US, UK, Eurozone and Japan), we find that portfolios that maximize the excess growth rate are characterized by a strong negative exposure to the low volatility factor and a higher than 1 exposure to the market factor, implying that such portfolios are attractive alternatives to competing smart portfolios in markets where the low volatility anomaly does not hold (e.g. in the UK, or in rising interest rate scenarios) or in bull market environments.     

技术多元化、发明者网络嵌入与军民融合企业技术创新效率

采用随机前沿模型对2015—2020年中国内地107家军民融合企业技术创新效率进行测算,并基于军民融合企业专利数据构建技术多元化、发明者网络嵌入（结构洞和网络密度）等指标。运用社会网络分析与多元线性回归方法,实证分析技术多元化、发明者网络嵌入及两者交互作用、结构洞与网络密度的互补关系/平衡关系对军民融合企业技术创新效率的影响。结果发现：技术多元化、结构洞及两者交互作用对军民融合企业技术创新效率具有正向影响;网络密度及其与技术多元化的交互作用对军民融合企业技术创新效率具有负向影响;网络密度和结构洞的互补关系会抑制军民融合企业技术创新效率提升,但两者在军民融合企业内部的平衡关系能够促进军民融合企业技术创新效率提升。     

中日产业内贸易发展实证分析

本文通过对1992年至2004年中日产业内贸易指数及其变动情况的计算和分析,得出中日产业内贸易综合指数稳定上升的趋势,特别是机械、电子类商品的产业内贸易规模大、程度深。分析了中日产业内贸易发生的原因和特点,进而提出了中日产业内贸易总体规模扩大、机电产业为重点的发展趋势。     

Diversification and cash dynamics

Why do diversified firms hold significantly less cash than focused firms? We study this question using a dynamic model of corporate investment, saving, and diversification decisions. We find that investment dynamics are more important in explaining the cash differences than financing frictions. More efficient internal capital markets increase cash differences and are especially valuable when a firm diversifies or refocuses. Contrary to static models, more diverse conglomerates have lower cash differences. Endogenous selection (diversifying firms are larger and have better growth opportunities) accounts for 68% of the cash difference, and the diversification event itself reduces cash holdings by 32%.     

Can investors of Chinese energy stocks benefit from diversification into commodity futures?

We attempt to evaluate the diversification potential of commodity futures for energy stocks in China. With a variety of copula functions and three risk-based dynamic measures, our results show that even though commodity futures are not helpful in improving the risk-adjusted returns of energy stocks, they can significantly reduce the volatilities and expected-shortfalls of the diversified portfolios. Such diversification benefits are much larger during large market downturns than during normal times. In particular, gold (copper) futures are the most (least) attractive in diversifying risks of energy stocks in most cases. The results also highlight that the non-linear dependence cannot be ignored when estimating the diversification benefits, and more various risk hedging strategies are expected for investors holding energy stocks, especially coal company stocks.     

Innovative restaurants in a mass-tourism city: Evidence from Antalya

This paper is about innovative restaurants in the single-asset (sun-sea-sand) mass-tourism city of Antalya, and focuses on the supply side of the restaurant market. The broader aim of the paper is to show that the mass-tourism city of Antalya is more differentiated than one might expect. The specific aim of the paper is to find out what types of restaurants are more innovative than others and in what types of tourism places in the city they are located. The empirical research is based on interviews with 54 managers and chefs, the results of which are analysed with quantitative methods of relational analysis such as correspondence- and chi-square analysis. The main result of the empirical research is that high-quality restaurants, visited by a mix of locals and tourists, and are located in a specific urban places, are most innovative.