Predictors of export performance in developing economies: a longitudinal analysis of Moroccan SMEs

Purpose: To help increase understanding of the export performance, we investigate the influence of firm size, research and development (R&D), advertising expenditures and network relationships, and develop a conceptual model to increase export intensity. Design/methodology/approach: The research involved a four-year longitudinal study of export performance of 168 exporting SMEs in Morocco (672 observations). The two-stage least square estimation (G2SLS) was used to test the hypotheses. Findings: The findings of the two-stage least square estimation (G2SLS) suggest that export sales and domestic sales are interdependent and influence each other. R&D expenditures and network affiliation have positive and significant impact on export sales, while advertising expenditure has a negative and significant influence on export sales. Research limitations/implications: Readers should use caution in generalizing the findings unless verified in other developing contexts. Practical implications: The findings of this study are useful for managers and export policy makers in developing countries. A proper understanding of the predictors of export performance may help them encourage the growth and diversification of exports that is so vital for developing countries. Originality/value: Export performance is a key element in the field of international marketing. Unfortunately, the literature exhibits a lack of empirical studies in developing countries, particularly in Maghreb regions. The empirical testing of the theoretical model in a developing economy is a significant contribution to fill the needed gap in the literature toward generalizing findings.     

GB/T2542-2012《砌墙砖试验方法》合理性分析及建议

本文是在GB/T2542-2012《砌墙砖试验方法》实施后,在操作实践中发现配套设备、试验过程和标准的落实中存在一些问题。通过对这些问题进行分析,提出合理化的建议。     

How useful is an Asian Currency Unit (ACU) index for surveillance in East Asia?

An Asian Currency Unit (ACU) index is constructed using an alternative procedure which minimizes a basket or portfolio of assets expressed in terms of national currencies. Using this estimated ACU index and an ACU deviation indicator, the main finding of this study based on the current trajectory of East Asian currencies relative to this regional ACU benchmark is that there is a formation of two contrasting groups of countries in the region—one group of strong currencies and one group of weak currencies. We emphasize that this contrasting trajectory in East Asian intra-regional exchange rates implies disturbed competitive trading relationships in the region, which may result in wasteful beggar-thy-neighbor policies. As emphasized in other recent studies (e.g., Kawai and Takagi, 2012), the region needs a framework for exchange rate policy coordination that will promote intra-regional exchange rate stability. We suggest two important ways in which the region can capitalize on using an ACU index for surveillance purposes in the immediate term. One way is to assess “over- and undervaluation” of individual currencies from the regional ACU average. The other is to use it as a monitoring device for excessive flows of international capital within the region.     

Structural breaks in the mean of dividend-price ratios: Implications of learning on stock return predictability

In their out-of-sample predictions of stock returns in the presence of structural breaks, Lettau and Van Nieuwerburgh (2008) implicitly assume that economic agents’ perception of the regime-specific mean for the dividend-price ratio is time-invariant within a regime. In this paper, we challenge this assumption and employ least squares learning with constant gain (or constant-gain learning) in estimating economic agents’ time-varying perception for the mean of dividend-price ratio. We obtain better out-of-sample predictions of stock returns than in Lettau and Van Nieuwerburgh (2008) for both the U.S. and Japanese stock markets. Our empirical results suggest that economic agents’ learning plays an important role in the dynamics of stock returns.     

劳动异质情况下的产业结构偏离及其影响因素分析——基于2006～2013年全国产业行业数据

本文充分考虑劳动异质性，利用产业人力资本结构，重新核算三次产业结构偏离度，发现第一产业和第三产业结构偏离程度均被高估，第二产业结构偏离被低估，进而指出“民工荒”、大学生就业难等现象产生的原因是第一产业可转出人力资本减少，第二产业需求旺盛，而第三产业由于发展不足陷入低水平均衡状态。最后通过系统的影响因素分析发现，解决我国结构偏离和就业问题的重点在于优化需求结构、合理规划产业发展路径以及全面推进城镇化和市场化进程，关键更在于释放农村消费市场巨大潜力和全面加快第三产业发展。     

Net foreign asset (com)position: Does financial development matter?

We investigate the relationship between a country's domestic financial development and the (composition of its) net foreign asset position using a pooled mean group estimator and data for 50 countries for the 1970–2007 period. The results show that financial development reduces a country's long-run net foreign asset position. In addition, financial development leads to higher net equity and lower net debt positions. These findings confirm the theoretical predictions of Mendoza et al. (2009). The results are robust to using different indicators of financial development and inclusion of the level of development of a country in the cointegrating relationship.     

A number‐of‐modes reference rule for density estimation under multimodality

We consider kernel density estimation for univariate distributions. The question of interest is as follows: given that the data analyst has some background knowledge on the modality of the data (for instance, ‘data of this type are usually bimodal’), what is the adequate bandwidth to choose? We answer this question by extending Silverman's idea of ‘normal‐reference’ to that of ‘reference to a Gaussian mixture’. The concept is illustrated in the light of real data examples.     

碳排放权交易、损益偏离与绿色经济效率关系研究

"双碳"目标展现了中国作为负责任的大国,对建设人类命运共同体的担当,碳排放权交易是实现这一目标的重要途径,但其对地区经济与环境的双重影响依然有待检验。结合1997—2017年中国省级数据,采用包含非期望产出的SBM-DEA模型测度地区绿色经济效率,以碳排放权交易试点为准自然实验,运用合成控制法评估试点政策对地区绿色经济效率的影响,并采用空间计量模型从损益偏离视角展开机制检验。研究发现:碳排放权交易试点政策能够显著提升地区经济效率,运用双重差分模型和PSM-DID进行稳健性检验后,基本结论依然可靠。缓解"收益在外,污染在内"的损益偏离现象,是碳排放权交易试点机制提升绿色经济效率的有效途径。随后提出通过进一步完善碳排放权交易市场机制,进而推动我国绿色发展的相关政策启示。     

《中庸》之“中庸”三维度释义

《中庸》之＂中庸＂持久而深刻,它是以正确性为内在精神,以恰当与适度为标志,以事物整体和谐、实现矛盾协调为目标,是振荡中维持平衡的过程及其＂得中＂这一瞬间之表象。它具有中庸之道（原则）、中庸之德（品德）、中庸之法（方法）三维度之义：既是哲学范畴,也是伦理学说,并代表了一种思想方法;既是事物运行的客观形态,又是儒家的世界观、人生观,还是＂折两用中＂的方法论。     

基于回弹法混凝土强度测定研究

介绍了回弹法测定混凝土强度的原理,利用最小二乘法求得了大庆地区混凝度强度测定的回弹法公式.