Fare elasticities of demand for direct and indirect flights in sub-Saharan Africa

This article examines the different demands for direct and indirect flights within sub-Saharan Africa. It develops both a simple reduced form model and a more refined two equation simultaneously system to examine bookings and fares on the major air transportation corridors. Using panel data, this allows estimation of the different fare elasticities of demand for direct and indirect services between the continents’ major cities as well as assessing the respective merits of the two models used.     

Fiscal shocks and real exchange rate dynamics: Some evidence for Latin America

This paper analyses the effects of fiscal shocks in selected Latin American countries using a two-country model for output, labour input, government spending and relative prices. Dynamic simulation techniques are then applied, in particular to shed light on the possible effects of fiscal imbalances on the real exchange rate. Using quarterly data over the period 1980-2006, we find that in a majority of cases fiscal shocks are the main driving force of real exchange rate fluctuations.     

Purchasing management in the luxury industry: organization and practices

Traditional supply chain models were developed mainly for non-luxury companies and find very little correspondence in the field of luxury, which is considered here as a business super-area including heterogeneous enterprises, belonging to different sectors, which have in common customers characterized by the “need for luxury”. The objective of this paper is to investigate, through a multiple case-study research, peculiar purchasing and supply management practices put in place by luxury firms and to provide a classification of the most recurring approaches. Relevant dimensions (i.e. product complexity and sale volume) to classify luxury firms practices have been used: as a result, four groups of companies have been identified and their purchasing practices described.     

Structural and Cyclical Factors behind Current Account Balances

Global external imbalances widened persistently over the last several years and have narrowed abruptly over the course of the financial crisis. Understanding the extent to which structural or cyclical factors may have driven these patterns is important to assess the likely evolution of global imbalances going forward, as well as the potential adjustment that can be achieved through changes in policy. This paper assesses the link between structural and cyclical factors and current account balances using a panel of 94 countries from 1973 to 2008. We find that the medium‐term evolution of global external imbalances can be related in large part to structural factors including cross‐country differences in demographics, fiscal deficits, oil dependency and intensity, stage of economic development, financial market development, and institutional quality. Part of the narrowing in current account balances since the financial crisis appears to be related to various cyclical factors including changes in output growth, oil prices, and exchange rates, and may be expected to reverse alongside the economic recovery.     

A revised version of the Cathcart & El-Jahel model and its application to CDS market

Decisions in Economics and Finance - The paper considers the pricing of credit default swaps (CDSs) using a revised version of the credit risk model proposed in Cathcart and El-Jahel (2003)....     

基于GIS与AHP法的河南省经济格局时空分异研究

［目的］研究区域经济格局对揭示经济发展空间演变机制和实现区域可持续发展具有重要的意义。文章以粮食生产核心区——河南省为例,通过定量刻画其济格局时空分异特征,明确河南省经济格局的发展态势和演化特征,为河南省经济发展提供参考。［方法］文章采用GIS空间分析和AHP方法,通过建立经济评价指标体系,基于2010—2015年河南省的统计年鉴数据评价其经济格局分异特征。［结果］（1）总体上,河南省国民生产总值持续增长,经济发展持续向好,但经济增速逐年放缓。（2）河南省经济空间格局先后经历了“八”字形、“一”字形演变特征,并逐步形成以郑州为中心的“十”字形经济空间格局。（3）全省中高经济发展水平城市数量增多,各地市经济发展的差异逐步缩小。［结论］河南省经济内部差异呈下降趋势,全域经济带动效益开始显现,应强化城市辐射效应,并加强对更小尺度经济格局演变的研究。     

Assessing skewness in financial markets

It is a matter of common observation that investors value substantial gains but are averse to heavy losses. Obvious as it may sound, this translates into an interesting preference for right-skewed return distributions, whose right tails are heavier than their left tails. Skewness is thus not only a way to describe the shape of a distribution, but also a tool for risk measurement. We review the statistical literature on skewness and provide a comprehensive framework for its assessment. Then, we present a new measure of skewness, based on the decomposition of variance in its upward and downward components. We argue that this measure fills a gap in the literature and show in a simulation study that it strikes a good balance between robustness and sensitivity.     

Sub-sovereign bond buyback: a way forward for debt-laden regions in austerity

ABSTRACT

Previous academic literature has criticised bond buyback as a ‘”boondoggle” benefiting a country’s creditors’—meaning that buybacks are a wasteful use of public money. This paper challenges the narrow financial–economic perspective behind that statement by adopting a broader socio-political framework that includes the potential benefits of buyback for citizens, not just financial market costs. In particular, buyback does not necessarily require a budget surplus via higher local taxes and/or increased austerity measures.     

Effect of ownership structure on underinvestment and overinvestment: empirical evidence from Spain

This paper investigates how ownership affects the investment‐cash flow sensitivity by taking into account the non‐linearities of ownership with respect to firm value, and using a free cash flow index and a criterion for financial constraints to disentangle underinvestment and overinvestment. Interesting results are provided by estimating using the Generalized Method of Moments to eliminate the endogeneity problem. The alignment of interests between owners and managers and the monitoring by concentrated ownership both alleviate the sensitivity of investment to cash flow both in underinvestor and overinvestor firms. However, in the presence of controlling owners, underinvestment and overinvestment are exacerbated.     

Cost-effectiveness of metformin plus vildagliptin compared with metformin plus sulphonylurea for the treatment of patients with type 2 diabetes mellitus: a Portuguese healthcare system perspective

Objective:

To evaluate the cost-effectiveness of vildagliptin plus metformin vs generic sulphonylurea plus metformin in patients with type 2 diabetes mellitus, not controlled with metformin, from a Portuguese healthcare system perspective.

Methods:

A cost-effectiveness model was constructed using risk equations from the UK Prospective Diabetes Study Outcomes Model with a 10,000-patient cohort and a lifetime horizon. The model predicted microvascular and macrovascular complications and mortality in yearly cycles. Patients entered the model as metformin monotherapy failures and switched to alternative treatments (metformin plus basal-bolus insulin and subsequently metformin plus intensive insulin) when glycated hemoglobin A1c >7.5% was reached. Baseline patient characteristics and clinical variables were derived from a Portuguese epidemiological study. Cost estimates were based on direct medical costs only. One-way and probabilistic sensitivity analyses were conducted to test the robustness of the model.

Results:

There were fewer non-fatal diabetes-related adverse events (AEs) in patients treated with metformin plus vildagliptin compared with patients treated with metformin plus sulphonylurea (6752 vs 6815). Addition of vildagliptin compared with sulphonylurea led to increased drug acquisition costs but reduced costs of AEs, managing morbidities, and monitoring patients. Treatment with metformin plus vildagliptin yielded a mean per-patient gain of 0.1279 quality-adjusted life years (QALYs) and a mean per-patient increase in total cost of €1161, giving an incremental cost-effectiveness ratio (ICER) of €9072 per QALY. Univariate analyses showed that ICER values were robust and ranged from €4195 to €16,052 per QALY when different parameters were varied.

Limitations:

The model excluded several diabetes-related morbidities, such as peripheral neuropathy and ulceration, and did not model second events. Patients were presumed to enter the model with no diabetes-related complications.

Conclusion:

Treatment with metformin plus vildagliptin compared with metformin plus sulphonylurea is expected to result in a lower incidence of diabetes-related AEs and to be a cost-effective treatment strategy.