Secondary trading of airport slots as a combinatorial exchange

In our research we propose a market formalization of secondary trading of airport slots. This proposed market is managed through an individual rational and budget balanced combinatorial slot exchange. The suggested market mechanism allows consideration of en-route sector capacities during the slot allocation process. We quantify the potential advantage of the market by comparing it with current practice. The results show that solutions that appear optimal when neglecting en-route sector capacities can be infeasible when taking capacities into account. Finally, in the proposed market the existence of grandfather rights does not seem to affect airline costs in a significant way.     

An AHP analysis of air traffic management with target windows

The main operational concept of Single European Sky ATM Research Programme is the notion of business trajectory. One possible implementation is based on the notion of a contract of objectives; an agreement among the main air traffic management actors on spatial and temporal intervals called target windows. These 4D windows are defined prior to flight departure by the airlines, airports and air navigation service providers to increase punctuality. We use an analytic hierarchy process to assess the opportunity of implementing this concept by considering the views of experts. The findings indicate that there are net benefits for airlines and air navigation service providers but not for airports     

High‐Performance Management Practices and Employee Outcomes in Denmark

High‐performance work practices are frequently considered to have positive effects on corporate performance, but what do they do for employees? After assessing the correlation between organizational innovation and firm performance, this article investigates whether high‐involvement work practices affect workers in terms of wages, wage inequality and workforce composition. The analysis is based on a survey directed at Danish firms matched with linked employer–employee data and also examines whether the relationship between high‐involvement work practices and employee outcomes is affected by the industrial relations context.     

Measuring and Optimizing Portfolio Credit Risk: A Copula‐based Approach*

In this work, we present a methodology for measuring and optimizing the credit risk of a loan portfolio taking into account the non‐normality of the credit loss distribution. In particular, we aim at modelling accurately joint default events for credit assets. In order to achieve this goal, we build the loss distribution of the loan portfolio by Monte Carlo simulation. The times until default of each obligor in portfolio are simulated following a copula‐based approach. In particular, we study four different types of dependence structure for the credit assets in portfolio: the Gaussian copula, the Student's t‐copula, the grouped t‐copula and the Clayton n‐copula (or Cook–Johnson copula). Our aim is to assess the impact of each type of copula on the value of different portfolio risk measures, such as expected loss, maximum loss, credit value at risk and expected shortfall. In addition, we want to verify whether and how the optimal portfolio composition may change utilizing various types of copula for describing the default dependence structure. In order to optimize portfolio credit risk, we minimize the conditional value at risk, a risk measure both relevant and tractable, by solving a simple linear programming problem subject to the traditional constraints of balance, portfolio expected return and trading. The outcomes, in terms of optimal portfolio compositions, obtained assuming different default dependence structures are compared with each other. The solution of the risk minimization problem may suggest us how to restructure the inefficient loan portfolios in order to obtain their best risk/return profile. In the absence of a developed secondary market for loans, we may follow the investment strategies indicated by the solution vector by utilizing credit default swaps.     

Creditor protection,judicial enforcement and credit access

We investigate the impact of the legal system on whether firms obtain the credit they apply for or not. Data comprise unique information provided directly by 48,590 firms from 11 European countries. We look at the strength of creditor protection, the strength of property rights, the time taken to resolve a dispute, the dispute resolution process’s costs and the number of procedures the plaintiff faces using data provided by the World Bank and the Heritage Foundation. The results suggest that the more efficient the judicial enforcement system is, and the higher the creditor protection is, the lower the probability that the firms are partially or totally denied credit. Our results are robust to selection bias (Heckman selection) as well as different controls and different estimation techniques. We find that these variables have considerable economic impact: the probability of obtaining credit is up to 40% higher in countries with more robust legal systems.     

Investment–cash flow sensitivities,credit rationing and financing constraints in small and medium-sized firms

The controversy on whether investment–cash flow sensitivity is a good indicator of financing constraints is still unsolved. We apply a comprehensive approach by cross-validating our analysis with both balance sheet and qualitative data on self-declared credit rationing and financing constraints on a sample of mainly small and medium-sized firms. Our qualitative information shows that (self-declared) credit rationing is (weakly) related to both traditional a priori factors—such as firm size, age and location—and lenders’ rational decisions taken on the basis of their credit risk models. We use the qualitative information on firms which were denied (additional) credit to provide evidence relevant to the investment–cash flow sensitivity debate. The evidence shows that self-declared credit rationing significantly discriminates between firms which possess or not such sensitivity, while a priori criteria do not. The same result does not apply when we consider the wider group of financially constrained firms (which do not seem to have a higher investment–cash flow sensitivity), supporting the more recent empirical evidence in this direction.     

Logistics and supply chain management in luxury fashion retail: Empirical investigation of Italian firms

The Italian industry of fashion goods is a business worth 67.6€ billion in 2006 (Il Sole 24ore, January 10, 2007), of which about 26€ billion is due to the luxury segment. Marketing gurus state that “consumers everywhere at every income level want more luxury” [Danziger, P.N., 2005. Let them Eat the Cake: Marketing Luxury to the Masses as well as the Classes. Dearborn Trade Publishing, Chicago]: therefore, companies should move brands towards a higher positioning and add more valuable features to products and services, but this cannot be obtained only by means of marketing efforts. Which is the role of operations and supply chain management in luxury fashion companies’ success? This paper presents the results of the exploratory stage of a research project ongoing at Politecnico di Milano and dealing with supply chain management in the luxury fashion industry. In total, 12 Italian luxury fashion retailers have been studied in order to describe the main features of operations and supply chain strategies in the luxury fashion segment and to identify their role with respect to the relevant critical success factors.     

ICT services and small businesses’ productivity gains: An analysis of the adoption of broadband Internet technology

We analyse the impact of the adoption of broadband Internet technology on the productivity performance of small and medium enterprises (SMEs). We distinguish access to the broadband infrastructure from the adoption of complementary services, i.e., different types of broadband software applications. The empirical analysis considers a sample of 799 firms observed from 1998 to 2004 that are representative of the population of Italian SMEs. Our econometric estimates indicate that the impact of the adoption by SMEs of basic broadband applications is negligible (or even negative). Conversely, SMEs are found to benefit from adopting selected advanced broadband applications depending on several contingent factors: (i) their industry of operations (services vs. manufacturing); (ii) the relevance of the specific broadband software applications for SMEs’ industry of operation; and (iii) the undertaking of complementary strategic and organisational changes.     

IMP studies: A bridge between tradition and innovation

“Combining the Social and Technological Aspects of Innovation: Relationships and Networks” was the title of the 28th IMP Conference held in Rome, at Università Cattolica del Sacro Cuore in 2012.