Economic viability of private commons: Framework and guidelines for profitability

Ongoing regulatory reforms have led to several novel spectrum sharing models under the general umbrella of dynamic spectrum sharing. The private commons model introduced by FCC in 2004 allows spectrum licensees to provide secondary access to spectrum on an opportunistic basis while retaining ownership. Since wireless communication systems are typically overprovisioned in order to deliver service-level guarantees to (primary) users under short-term load variations, this model bears significant potential by facilitating utilization of temporal and spatial surplus of capacity through serving secondary users at possibly different service levels. A potential barrier to adoption of the private commons model is the uncertainty about secondary price–demand relationship which is difficult to predict in an emerging market: A selected price for secondary access may be profitable for some values of secondary demand but not for others, leading to a profound uncertainty about ultimate benefit of spectrum sharing. This paper aims to eliminate such an uncertainty by devising concrete guidelines and methods for profitability. The paper establishes that the price of secondary spectrum access can be chosen to guarantee profitability for any value of secondary demand: It is shown that for both the coordinated and uncoordinated commons regimes a profitable price should exceed a threshold value, which can be calculated. Hence profitability of private commons is insensitive to the demand function. This observation has two complementary interpretations: From a business perspective it provides a constructive approach to profitability; and from a regulatory perspective it provides reassurance that private commons is a healthy model. The paper also leverages the insensitivity property and outlines a technique to further enhance revenue via iterative spectrum offerings.     

A profit assessment model for equipment inspection and replacement under renewing free replacement warranty policy

For many types of equipment whose maintenance requires skilled labor or whose random failure may have serious consequences, such as aircraft engines, medical equipment and others, customers generally prefer to entrust maintenance activities to the manufacturer or any of its representatives. The latter must, in turn, provide the customer with a maintenance program that is economically viable for both parties. In this study, the customer and the manufacturer agree on what follows regarding a non-self-announcing failure equipment whose state is only known through inspection: during the warranty period, the manufacturer inspects the equipment according to a specified schedule which he establishes taking into account that the costs incurred for inspections and replacements are supported by him during the warranty period. After the expiration of the warranty, inspections and replacements are performed by the manufacturer and billed to the customer. Moreover, penalties related to inactivity periods between failures and their detection are always supported by the manufacturer. The warranty is applicable to any equipment replaced during the validity period of the service contract. This type of contract generates a profit for the manufacturer. In this paper, an analytical model taking into account the commitments of both parties has been developed. The model allows generating the instants (x₁, x₂,…, x_n) at which the inspections must be performed and the corresponding expected profit for the manufacturer while considering the warranty period offered on the market for similar equipment. An algorithm has also been developed to generate the inspection instants given the costs structure and the lifetime probability distribution of the equipment. In a context where business models argue for a greater implication of suppliers towards their customers, the proposed decision model may be relevant and very useful.     

Risk tolerance,gender, and entrepreneurship: The Palestinian case

This paper analyzes the inter‐relationships between entrepreneurial propensity, fear of failure (FoF), and gender in Palestine, using the Global Entrepreneurship Monitor (GEM) adult population survey (APS) data for 2009, 2010, and 2012, and it is the first that addresses Gender, fear of failure, and entrepreneurship for Palestine. The paper extends the analysis of the endogeneity issue of FoF by using the conditional mixed process (CMP), which improves the efficiency of the estimates. The results show that the fear of failure negatively affects entrepreneurial status, while skill perception does the opposite. It is also found that fear of failure is higher among women, although this result is not stable over time. Using the CMP specification, we find that gender and fear of failure both reduce the predicted probability of entrepreneurship consistently over time. The only variable that consistently predicts fear of failure and is significant is skill perception, which has a negative impact. Policy implications of this research point to the importance of reducing the gender gap in entrepreneurship. In particular, there is a need to improve their skill perception in order to encourage more females to be entrepreneurs. Networking, vocational education and media coverage of success stories are among the tools that could potentially achieve this result.     

Robbins and Malthus on Scarcity,Abundance, and Sufficiency

The problem of scarcity is often talked about, but it is rarely clearly defined. In this article, two different views of scarcity are outlined: absolute and relative scarcity. These two are respectively exemplified by Malthus's and Robbins's views of scarcity. However, both of these views tend to naturalize and universalize scarcity, and thus overlook abundance and sufficiency, which are important states in the social provisioning process. It is argued that this is due to ignorance of the sociocultural causal underpinnings of scarcity, abundance, and sufficiency (SAS). The introduction of these mechanisms enables further conceptual differentiation of SAS (e.g., quasi‐, artificial‐, natural‐).     

End-of-life aircraft treatment in the context of sustainable development,lean management,and global business

Dealing with retired aircraft taking into account the environmental, social, and economic impacts is emerging as an air transportation problem for the near future. The players involved in the problem wish to solve this challenge in a systematic way to benefit from the value extracted from the core activities of the end-of-life (EoL) aircraft treatment, decrease the environmental impacts, and at the same time maximize the social value. This paper proposes a holistic approach to EoL aircraft treatment considering lean management, sustainable development, and the global business environment. An integrated optimization framework is proposed to support decision-making at both the strategic and managerial levels. The flexibility of the framework makes it possible to compare different business models, dismantling strategies, and network structures that impact the efficiency, stability, and leanness of the recovery network. A solution methodology based on the joint application of fuzzy interactive approach and genetic algorithm is introduced. The application perspective and guidelines for pilot study are also provided. To the best of our knowledge, this is the first time that recovery of EoL aircraft is considered based on three aspects of sustainability, lean, and global business. Therefore, this study provides many promising perspectives in this context to enrich the literature of EoL aircraft as a new aviation industry challenge and opportunity.     

On the evaluation of power in parliaments and government formation

This paper is devoted to the study of power in Parliaments. We explain how the power of coalitions can be computed after elections. We add to the existing literature by using this analysis to predict what government may emerge from these elections.