Compound gamma bivariate distributions

Summary Bivariate distributions, which may be of special relevance to the lifetimes of two components of a system, are derived using the following approach. As the two components are part of one system and therefore exposed to similar conditions of service, there will be similarity between their lifetimes that is not shared by components belonging to different systems. The lifetime distribution for a given system is assumed to be Gamma in form (this includes the exponential as a special case; extension to the Stacey distribution, which includes the Weibull distribution, is straightforward). The scale parameter of this distribution is itself a random variable, with a Gamma distribution. We thus obtain what might be termed a compound Gamma-Gamma bivariate distribution. The cumulative distribution function of this may be expressed in terms of one of the double hypergeometric functions of Appell.Generalised hypergeometric functions play an important part in this paper, and one of Saran's triple hypergeometric functions is obtained when generalising the above model to permit the scale parameters of the distributions for the two components to be correlated, rather than identical.Work started while the author was with the Transport Studies Group, University College London.     

‘Real without being concrete’: the ontology of public concern and its significance for the Social Amplification of Risk Framework (SARF)

Abstract

Public concern is a pivotal notion in the risk perception, communication and management literature. It is, for example, a central concept with regard to the social amplification of risk, and as a justification for policy attention. Despite its ubiquity, the notion of public concern remains a ‘black box’ presenting a poorly understood state of affairs as a reified matter-of-fact. Paying attention to the deployment and metrics of public concern, and the work it is required to do, will enhance the power of approaches to understanding risk, and policymaking. Thus, the broad purpose of this paper is to unpack the notion of public concern by adopting an ontological yet critical perspective, drawing on a range of literature that considers ontology. We reflect on how publics and public concern have been conceptualised with regard to the dichotomies of individual/social and private/public, given that they imply different levels and dimensions of concern. We draw on empirical work that illuminates the assessment and measurement of public concern and how the public have responded to risk events. Considering public concern through an ontological lens affords a means of drawing renewed critical attention to objects that might otherwise appear finished or ready-made.     

Internationalisation Processes,Networking and Local Embeddedness in Technology-Intensive Small Firms

The paper argues that technology-intensive small firms often need to internationalise their activities, and especially sales, at a very early stage of their development because of the limited and global nature of the technological market niche which they have been set up to exploit. From a survey of 100 such firms in the Cambridge and Oxford regions, it demonstrates that many technology-based smaller firms are engaged in a range of international networks and internationalisation processes, including internationalisation of markets, research collaboration, labour recruitment, ownership and facilities location. Technology-intensive firms reporting high levels of internationalisation also differ significantly from those which are more nationally-oriented, for example in terms of size, age, research intensity, university links, and innovativeness. There are also differences with respect to recent growth rates. Finally, the paper demonstrates that far from substituting international for local networks, technology-intensive firms which have achieved high levels of internationalisation in fact also exhibit above-average levels of local networking with respect to research collaboration and intra-industry links. Internationalisation therefore appears to be grounded or embedded in successful local networking and research and technology collaboration.     

Interaction of size,book‐to‐market and momentum effects in Australia

This study seeks to disentangle the effects of size, book‐to‐market and momentum on returns. Initial results show that each characteristic has a role in explaining returns, but that there is interaction between size and momentum, as well as between size and book‐to‐market. Three key findings emerge. First, the size premium is the strongest, particularly in the loser portfolios. Second, the value premium is generally limited to the smallest portfolios. Third, the momentum premium is evident for the large‐ and middle‐sized portfolios, but loser stocks significantly outperform winner stocks in the smallest size portfolio. When these interactions are controlled with multivariate regression, we find a significant negative average relation between size and returns, a significant positive average relation between book‐to‐market and returns, and a significant positive average relation between momentum and returns.     

Real Longevity Insurance with a Deductible: Introduction to Advanced-Life Delayed Annuities (ALDA)

Abstract

This paper explores the financial properties of a concept product called an advanced-life delayed annuity (ALDA). The ALDA is a variant of a pure deferred annuity contract that is acquired by installments, adjusted for consumer price inflation, and pays off toward the end of the human life cycle. The ALDA concept is aimed at the growing population of North Americans without access to a traditional defined benefit (DB) pension plan and the implicit longevity insurance that a DB plan contains. I show that under quite reasonable pricing assumptions, a consumer can invest or allocate $1 per month, while saving for retirement, and receive between $20 and $40 per month in benefits, assuming the deductible in this insurance policy is set high enough. The ALDA concept might go a long way in mitigating the psychological barrier to voluntary lump-sum annuitization.     

The transformational model of social activity and economic analysis: a reinterpretation of the work of J.R. Commons

The work of J.R. Commons, I want to argue, bears a close relationship to, is clarified by and informs, recent developments in social theory. Specifically, recent developments in social theory, elaborated under the heading of critical realism, serve to organize or systematize Commons' work in such a way as to defend it against the commonly made criticisms of incoherence and irrelevance to more general or theoretical concerns. On the other hand Commons' work, based as it is upon practical case study and intervention, serves both to extend or ‘deepen’ existing critical realist accounts and demonstrate their relevance for political economy.     

Polarities between Naturalism and Non-Naturalism in Contemporary Economics: An Overview

We provide a dynamic model of banking competition, in which bounded rationality of some competitors explains how the credit cycle is intensified. We model the economic cycle following Tobias F. Rötheli (2012b), who argues that boundedly rational banks, in their Bayesian learning, overestimate the probability of success during booms and underestimate it during recessions. We obtain three main results. First, the model suggests that pessimism/underconfidence is not a powerful driver of credit cycles. Instead, it supports the conclusion that it is euphoria during large upswings that leads to the next crunch. Second, the dynamization of the model provides further insight into the way boundedly rational competition intensifies the credit cycle. Third, it additionally predicts that the effects of behavioral biases are more pervasive when the quality of the niche markets is lower.     

Enhanced job satisfaction under tighter technological control: The paradoxical outcomes of digitalisation

Via a multiple case study of work in microfinance institutions in India, this paper reports on the experiences of field officers and branch managers following work digitalisation. It identifies and explains an intriguing post-digitalisation paradox of reported increased job satisfaction and tighter technological control diminishing branch managers' work-life balance. The paradox draws attention to the significance of context in workers' experiences of mobile digital technologies (MDTs) and contradicts previous studies on workers' positive experiences of adopting MDTs: the workers in this study did not experience greater autonomy or flexibility but reported enhanced employment security and status. The paper also adds to literature on employment relations following work digitalisation by revealing powerful enforcement of technological control, with ‘WhatsApp’ identified as a key managerial tool used for surveillance and discipline, and worker resistance at the margins.     

The effect of corporate real estate ownership on R&D innovation: credit relief vs. resource replacement in China

Against the background of supply-side structural reform and the real estate financialisation in China, this study investigates the impact of real estate holdings on R&D investment using data of enterprises listed on the Shanghai and Shenzhen stock exchanges. Our empirical results yield five main findings. First, enterprises holding more real estate assets face more serious financial constraints, thus restraining corporate innovation efficiency. Second, when the profit margin gap between entity enterprises and the real estate industry is larger, enterprises are more inclined to transfer industrial capital into the real estate industry, thus reducing R&D investment. Third, when the degree of marketisation is high, intensified market competition, the optimal allocation of factor and product markets, and stronger patent protection will weaken the restraining effect of corporate real estate holdings on R&D investment. Fourth, monopoly enterprises obtain potential profits more than undertaking risks from the real estate industry, they are more willing to hold real estate, thus strengthening the restraining effect of real estate holdings on innovation. Finally, investors' regional preference intensifies the restraining effect of corporate real estate holdings on R&D investment. Our empirical evidence can guide entity enterprises on how to effectively balance short-term (non-productive) and long-term (productive) capital investment.