Recenti sviluppi teorici del «Capital Asset Pricing Model»

Il presente studio prende in esame il CAPM e ne illustra i principali approcci teorici più recenti; soprattutto in questi ultimi anni, infatti, l'argomento ha attirato l'attenzione degli studiosi in campo finanziario e si presenta ancora molto interessante per i possibili sviluppi futuri. Senza esaurire l'argomento, che comporterebbe una trattazione molto ampia e una molteplicità di modelli a questo collegati, è parso utile ripercorrere l'iter logico e cronologico di questa teoria al fine di osservare come da un modello relativamente semplice sia stata a poco a poco enucleata tutta una serie di importanti problemi collaterali.

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This paper reviews the theoretical literature on the CAPM, considering the most important and recent approaches.Actually this model has been studied and developed very much in the financial field and further applications can be obtained in the future. The logical and historical development of the CAPM has been here the perspective to observe this theory, without exhausting the literature in this field, so the main aim is to present the relevant importance of the actual theory and some important problems which come from that.

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Lavoro svolto nell'ambito della ricerca CNR n. 78.00551.10.     

An Empirical Analysis of Competition in Brand Differentiated Oligopoly

The paper studies the behaviour of four oligopolistic firms in the Italian coffee market. We study whether their behaviour is better represented by Bertrand behaviour or by collusive pricing. We also investigate the role of advertising in product differentiation.     

FINANCIAL CONSTRAINTS, GLOBAL ENGAGEMENT, AND FIRM SURVIVAL IN THE UNITED KINGDOM: EVIDENCE FROM MICRO DATA

Financial constraints have been found to play an important role on various aspects of firm behavior. Yet, their effects on firm survival have been largely neglected. We use a panel of 61,496 UK firms over the period 1997–2002 to study the effects of financial variables on firms' failure probabilities, differentiating firms into globally engaged and purely domestic. Estimating a wide range of specifications, we find that lower collateral and higher leverage result in higher failure probabilities for purely domestic than for globally engaged firms. This can be seen as evidence that global engagement shields firms from financial constraints.     

Underpricing of venture backed IPOs: a meta-analysis approach

ABSTRACT

Listing firms are subject to underpricing mainly because of asymmetries of information, but IPOs backed by a venture capitalist are generally found to be subject to less underpricing. Although this condition is commonly verified by the empirical evidence, a consistent number of studies finds contrasting results. This paper aims to answer to the question: do venture capitalists effectively reduce underpricing at IPO? Evidence provides a negative answer, with venture-backed IPOs having higher underpricing especially in US markets. Meta-regression results confirm the different effect of VC between US and European IPOs. Results overall suggest that other explanations on underpricing might hold in US markets.     

Storable votes

Motivated by the need for more flexible decision-making mechanisms in the European Union, the paper proposes a simple but novel voting scheme for binary decisions taken by committees that meet regularly over time. At each meeting, committee members are allowed to store their vote for future use; the decision is then taken according to the majority of votes cast. The possibility of shifting votes intertemporally allows agents to concentrate their votes when preferences are more intense, and although the scheme will not achieve full efficiency, storable votes typically lead to ex ante welfare gains over non-storable votes. Welfare gains can be proven rigorously in the case of 2 voters. With more voters, counterexamples can be found, but the analysis suggests that the welfare improvements should continue to hold if one of the following conditions is satisfied: (i) the number of voters is above a minimum threshold; (ii) preferences are not too polarized; (iii) the horizon is long enough.     

Do universities knowledge spillovers impact on new firm’s growth? Empirical evidence from UK

The paper explores the effect of scientific institutions on firm’s growth, coupling regional science and entrepreneurship approaches. We focus on the role of universities, largely considered in the literature as the main source of knowledge spillovers. To this purpose, we centre our attention on UK public companies on the Alternative Investment Market (AIM), a market dedicated to young and growing companies in both science and non-science based industries. In the paper we investigate the growth determinants of 231 listed firms which have gone public during the period going from 1995 to 2006. To our purposes, in the empirical analysis we use the Gibrat’s Law of Proportionate Effects model. The results supports the hypothesis that, controlling for firm’s idiosyncratic factors and external forces, both universities knowledge input and output are important determinants of the growth of entrepreneurial firms listed on the AIM.

Close the loop: Evidence on the implementation of the circular economy from the Italian fashion industry

Fashion is widely considered as one of the most polluting and destructive industries to the environment and is a resource-intensive industry in which opportunities to reduce environmental impacts abound. By relying on an exploratory approach, this paper features an investigation into the circular economy (CE) practices of four purposefully selected Italian fashion companies. The study endorses the overlooked perspective of the product lifecycle (vis-à-vis the business model perspective), consistent with the key principles of the CE, to provide a comprehensive picture of CE practices implemented. This study engages with the current debate on the relationship between the concepts of sustainability and CE, supporting the idea that there is a beneficial relation between the two. The analysis shows the emergence of categories of CE-related practices as well as CE implementation challenges. The study also provides granular insights into the nature of these challenges that hinder the implementation of CE and demonstrates how they can be turned into sources of competitive advantage. Drawing on this emblematic evidence, we develop a set of theoretical and managerial implications.     

The persistence of firms’ knowledge base: a quantile approach to Italian data

The paper investigates the patterns of persistence of innovation and of the properties of firms’ knowledge base (KB) across a sample of Italian firms in the period 1998–2006. The analysis draws upon a theoretical representation of knowledge as a collective good, stemming from the recombination of knowledge bits that are fragmented and dispersed across economic agents. On this basis, we derived properties of the KB like the coherence, the cognitive distance and the variety, and investigated their patterns of persistence over time. The empirical analysis is implemented by exploring the autocorrelation structure of such properties within a quantile regression framework. The results suggest that the properties of knowledge are featured by somewhat peculiar patterns as compared with knowledge stock, and that such evidence is also heterogeneous across firms in different quantiles.     

Exploring “Underachievement” Among Highly Educated Young British-Bangladeshi Women

Abstract

Current mainstream wisdom portrays the young British-Bangladeshi community as underachieving in education. However, this study suggests that young British-Bangladeshi women tend to be high achievers in education. This research interrogates the multifaceted experiences of British-Bangladeshi women students to better understand the contested nature of their transition from educational achievement to labor market participation. The analysis draws on a combination of fieldwork done in two colleges in East London and Leeds in 2007 and secondary data collected by the Higher Education Statistical Agency on students who graduated from British higher education institutions in 2006. Although it focuses on the reality of young British-Bangladeshi women, the study shows that – especially for certain ethnic minorities – the absence of social resources, social networks, and egalitarian class relations can hamper the process of making good on educational achievements.     

The internal market and hospital efficiency: a stochastic distance function approach

The UK internal market was one of the first European attempts to introduce a competitive mechanism in the provision of hospital services. The assumption was that competition would have led hospitals to increase efficiency in the use of their resources. The aim of this paper is to analyse the effectiveness of this kind of reform by measuring the changes in technical efficiency of a panel of 52 acute Scottish hospitals observed from 1991/92 to 1996/97. The time period covers the whole duration of the internal market and the sample contains a different mix of both trusts and non-trusts, where the former embed the proper working of the reform. The selected model is a stochastic output distance function that includes an interaction dummy variable to allow for parameters to change over time. The results show a structural break after which hospitals change not only the way in which they provide their services, but also the kind of services they provide, favouring the quicker treatment of patients on a day basis. No significant improvement in technical efficiency is detected instead over time, nor any significant difference in efficiency between trusts and non-trusts.