Measuring the economic significance of mean-variance spanning

This paper investigates the economic significance of mean-variance spanning tests using three classical statistical tests in a unified framework. I show how to compute confidence intervals about the Sharpe ratios of tangent portfolios, the variance of return of minimum variance portfolios, as well as the certainty equivalent utility gains. I apply this statistical framework to the question of whether US investors should diversify internationally. The analysis suggests that a strong statistical rejection of the hypothesis that there is no improvement in the minimum variance portfolio’s standard deviation of return does not imply that there are no significant economic benefits to be made in terms of a substantial risk reduction. These results have important implications for empirical tests of mean-variance spanning as well as empirical assets pricing tests and minimum variance bounds on stochastic discount factors.     

Does it pay to be green? A disaggregated analysis of U.S. firms with green patents

The objective of this paper is to investigate the relationship between environmental performance and financial performance on a sample of 361 U.S. firms over the 2007–2016 period. We contribute to the literature by considering firms active in sustainable innovations by obtaining green patents. We also contribute to the literature by using disaggregated measures of environmental performance collected from the Bloomberg ESG database, including environmental disclosure score, greenhouse gas emissions, waste emissions and water use. Panel data regressions' results show that environmental transparency positively influences current accounting and stock market performance, but negatively influences the return on capital employed. Furthermore, lower pollution emissions tend to improve the current return on assets, while being harmful for the efficiency of long‐term capital employment at the same time. The empirical results also indicate that the Global Financial Crisis (2007–2010) increased the environmental transparency of firms with green patents but negatively impacted their price to earnings ratio. At the same time, lower waste disposal diminishes stock valuation while the opposite is true with water use. Taken together, our results suggest that environmental transparency and greenhouse gas emissions generally appear to be the most important environmental variables influencing financial performance, with increasing importance attributed to them by the market after the global crisis period.     

Managing multidimensional knowledge assets: HR configurations in professional service firms

The purpose of this article is to illustrate empirically how HR practices are configured to manage multidimensional knowledge assets. It contributes directly to the configurational approaches to HRM by identifying HRM systems that are used to manage various types of knowledge assets. First, we develop a framework from theory to categorise knowledge assets into human (industry and firm specific), social (entrepreneurial and co‐operative) and organisational capital (mechanistic and organic). Within this framework, we draw on data gathered in the 12 professional services firms to understand how HR practices enable the management of each knowledge asset. We identify two configurations of HR practices (organisationally and professionally focused). These configurations do not exist in isolation but are used simultaneously by organisations via either a targeted (different practices in different parts of the organisation) or a temporally segregated way (different practices for the same group of employees over time).     

Mean-variance hedging for interest rate models¶with stochastic volatility

The mean-variance hedging approach for pricing and hedging claims in incomplete markets was originally introduced for risky assets. The aim of this paper is to apply this approach to interest rate models in the presence of stochastic volatility, seen as a consequence of incomplete information. We fix a finite number of bonds such that the volatility matrix is invertible and provide an explicit formula for the density of the variance-optimal measure which is independent of the chosen times of maturity. Finally, we compute the mean-variance hedging strategy for a caplet and compare it with the optimal stategy according to the local risk minimizing approach. Received: 14 July 2000 / Accepted: 10 April 2001     

The Entrepreneurial Organization of Heterogeneous Capital*

abstract Transaction cost, property rights, and resource‐based approaches to the firm assume that assets, both tangible and intangible, are heterogeneous. Arranging these assets to minimize contractual hazards, to provide efficient investment incentives, or to exploit competitive advantage is conceived as the prime task of economic organization. None of these approaches, however, is based on a systematic theory of capital heterogeneity. In this paper we outline the approach to capital developed by the Austrian school of economics and show how Austrian capital theory provides a natural bridge between theory of entrepreneurship and the theory of the firm. We refine Austrian capital theory by defining capital heterogeneity in terms of subjectively perceived attributes, the functions, characteristics, and uses of capital assets. Such attributes are not given, but have to be created or discovered by means of entrepreneurial action. Conceiving entrepreneurship as the organization of heterogeneous capital provides new insights into the emergence, boundaries, and internal organization of the firm, and suggests testable implications about how entrepreneurship is manifested.     

Interrelationships between human capital,HRM and innovation in Belgian start-ups aiming at an innovation strategy

Research on the impact of human resource management (HRM) on firm performance has increased since the end of the nineties. Despite the pile of studies and results, critical assessments of this literature stream point to several empirical and theoretical gaps. We focus on two empirical gaps. First, there is a lack of attention to innovation as a measure of firm performance outcome. Most articles use financial (e.g., return on assets (ROA)), organisational (e.g., productivity) and employee related (e.g., commitment) performance measures. Yet, Western knowledge economies consider innovation to be a driving force of economic growth, and international competitive advantage. Moreover, innovation is a function of a firm's ability to create, manage and maintain knowledge. Because knowledge is created by and stored within individuals, human resources as well as HRM may play an important role as drivers of innovation. Second, HRM is considered to be a large company phenomenon. Yet, small businesses provide a great environment to study the HRM-performance relationship because of their transparent nature and the small distance between an individual's and a company's performance. Next, human resources and HRM are crucial to small businesses because they have less tolerance for inefficiency. We examine a sample of small start-ups that aim for an innovation strategy, but are not necessarily successful in terms of innovative output. We expect start-ups with superior human resources and HRM to produce more innovative output. The results show that both human capital (of owners/managers and employees) and HRM are important determinants of innovation in start-ups.     

The Economic Incentives and Consequences of Land Write-Ups

Firms in Taiwan are allowed to write up their assets when certain conditions are met. Tax benefits from higher depreciation expenses are granted to encourage corporate investment and capital maintenance. Land write-ups, unlike write-ups of depreciable assets, do not generate tax benefits. This paper investigates the economic incentives for firms in Taiwan to write up their land, and the security price reactions to land write-ups.
An analysis of annual financial data for the manufacturing firms listed in the Taiwan Exchange between 1982 and 1992 shows that firms write up their land by a larger amount when raising capital. Firms with relatively higher debt-asset ratios write up their land by a larger amount. Furthermore, the capital raised was invested in working capital or operational assets, but not in securities of other firms. The results suggest that land write-ups may reduce firms' difficulties in raising external capital, and may enhance corporate investments. The result from capital market analysis offers weak evidence that land write-ups are positively correlated with the market adjusted rate of returns of a firm's stock.     

A strategic human resource perspective of firm competitive behavior

Embedded within firms are unique stores of intangible human assets that likely influence the way firms compete. We argue that the human and social capital of a firm, particularly at the upper echelon and board of director (BOD) levels, contribute to the firm's awareness of the competitive environment and its motivation and ability to undertake numerous, complex, and forceful competitive actions. We also suggest that the firm's executive compensation systems moderate the effects of these intangible human assets on firm competitive behavior. By examining how human capital, intra-firm social capital, and executive compensation influence firm competitive behavior, we advance a strategic HRM perspective of firm competitive behavior and outline several implications for future research.     

Capital outflow liberalization and stock market reaction in an emerging market: Experience from Greece

This paper examines the response of the Greek equities market to the liberalization of capital flows during the 1992–1994 period. While past empirical research has largely examined the effects of capital inflow liberalization in emerging markets, we focus on capital outflow liberalization. In particular, we consider changes in the regulatory environment that allow domestic investors to hold foreign risky assets. Employing a time series of daily equity returns, a wealth effect is found that is indirectly linked to the announcement of capital flow liberalization. Additionally, our results reveal a significant change in the daily return distribution before and after final implementation. The views expressed in this paper are solely those of the authors and should not be interpreted as those of their respective affiliations.     

The mean-variance investment problem in a constrained financial market

This paper extends the mean-variance analysis and the two-fund separation theorem to a market with some constraints, such as, the incompleteness, prohibition of short-selling, and partial information, with stochastic interest rate, and with stochastic volatility for risky assets. By maximizing a quadratic utility of terminal wealth, we show that the efficient frontier for the problem is a straight line in the mean-standard-deviation diagram. The quadratic utility function exhibits mean-variance efficiency. Our results apply to portfolios of claims in a single period, multiperiod, and continuous time.