MINIMAL ENTROPY–HELLINGER MARTINGALE MEASURE IN INCOMPLETE MARKETS

This paper defines an optimization criterion for the set of all martingale measures for an incomplete market model when the discounted price process is bounded and quasi-left continuous. This criterion is based on the entropy–Hellinger process for a nonnegative Doléans–Dade exponential local martingale. We develop properties of this process and establish its relationship to the relative entropy "distance." We prove that the martingale measure, minimizing this entropy–Hellinger process, is unique. Furthermore, it exists and is explicitly determined under some mild conditions of integrability and no arbitrage. Different characterizations for this extremal risk-neutral measure as well as immediate application to the exponential hedging are given. If the discounted price process is continuous, the minimal entropy–Hellinger martingale measure simply is the minimal martingale measure of Föllmer and Schweizer. Finally, the relationship between the minimal entropy–Hellinger martingale measure (MHM) and the minimal entropy martingale measure (MEM) is provided. We also give an example showing that in contrast to the MHM measure, the MEM measure is not robust with respect to stopping.     

High-Tech Corporatism: Management-Employee Relations in U.S. Electronics Firms, 1920s-1960s

In this article I examine corporative management practices inelectronics firms in Boston and in Silicon Valley from the 1920sto the 1960s. Managers in several key firms developed thesepractices in response to political and professional ideologiesand as a way to address the problems of hiring, using, and retaininga highly skilled work force. They did this independently ofthe welfare capitalism plans of corporations such as EastmanKodak and before the guru theorists and work empowerment programsof the 1960s. The corporatist methods first developed in Bostonand further refined in Silicon Valley later diffused to mostU.S. firms in the software, computer, Internet, and biotechnologyindustries.     

ON NON‐MONETARY MEASURES IN THE FACE OF RISKS AND THE SIGNS OF THE DERIVATIVES

Vulnerability of both prudence and temperance towards a sure loss and towards a zero‐mean background risk seems to be a very realistic assumption on individual preference. This paper shows that when the concepts of prudence and temperance are defined in non‐monetary terms, the above assumption is equivalent to the usual signs of the successive derivatives of the utility function.     

Competition and Public Service Obligations: Regulatory Rules and Industries Games

The introduction of competition in regulated industries may have positive or negative side-effects on the provision of collective goods or services. The paper shows that these effects are closely related to two associated elements: the industrial strategies developed by utilities and the regulatory environment within which they operate. Regulatory rules and corporate strategies influence the treatment of public service obligations. This raises a major issue regarding the regulation of public utilities. To reduce the drawbacks of the introduction of competition, it is necessary to set regulatory rules that allow the implementation of market configurations enabling public utilities to follow a public service orientation rather than a pure market-based approach.     

Featuring Capability: How Carmakers Organize to Deploy Innovative Features across Products

Innovative features such as hands‐free car entry and ignition systems, stop‐start devices, telematics systems, and panoramic windshields are increasingly important to carmakers' innovation strategies. However, while product‐centric innovation has been extensively studied, there is less insight into the way companies implement their feature‐innovation strategies. The capability to explore, integrate, and deploy such attractive features is a critical dynamic capability; it allows carmakers to refresh their products, develop their competences, and maintain the efficiency of their traditional new product development. This research investigates the structures and processes of feature innovation in the automotive industry. It is based on a global investigation encompassing 9 generalist carmakers and 26 cases of feature innovation. The results show a clear trend, over the past decade, toward a structure of autonomous “advanced engineering” units and processes that are responsible for exploring innovative features and transferring them to multiple products. This paper details the key attributes of these units, and the role they play along the multiproduct learning cycle. Supplementing this structural analysis, the paper also identifies the coordination patterns between exploration and new product development activities. These results provide industry‐level insights into the way firms organize their feature‐innovation capability, and bring empirical elements to the ambidexterity literature.