Are Business Incubators Really Creating New Jobs by Creating New Businesses and New Products

This article examines the use of business incubators to enhance industrial innovation and new venture formation. Currently, the number of business incubators is rapidly growing. Yet, we have little solid evidence that such centers actually stimulate the growth and success of either innovations or new ventures. Gerald Udell examines incubators' resources and services in an effort to assess their potential impact. He conducted a survey of two hundred incubators and linked the results to a partial review of the literature to aid in the assessment of business incubators.     

Quantum Theory and Social Economics:

A bstract . The holistic approach of quantum theory is investigated as a tool for social economists to analyze and to interpret socioeconomic reality and paradigms. The link between quantum theory and the social economist's approach to socioeconomic reality, i.e. , the "what is," rests on the premise that each element of the socioeconomic universe relates to the whole system and vice versa. In other words, the meaning of each part is to be found in its implicit reflection of the whole of reality; it has no meaning exclusive of the whole. In terms of quantum theory, investigations of microeconomic processes are interwoven with the macroeconomic frame of reference of the observer. The very act of observation is to be considered as an integral part of the observed system.     

ESTIMATION AND SELECTION BIAS IN MEAN-VARIANCE PORTFOLIO SELECTION

Much research has focused on the problem of selecting portfolios without the benefit of parametric measures of risk and return. In this paper, a Monte Carlo technique is used to isolate the extent and nature of the problems introduced by this practice. The technique is employed in the context of classical statistical methodology without permitting short sales. It is shown that using estimators of expected return and risk not only obscures parametric values, but also affects portfolio composition in the Markowitz framework. In this study, these two components of bias are isolated and measured.     

International Patterns of Union Membership

This paper examines changes in unionization that have occurred over the last decade or so using individual level micro data on many countries, with particular emphasis on the United Kingdom, the United States and Canada. I document an empirical regularity not hitherto identified, namely the probability of being unionized follows an inverted U‐shaped pattern in age, maximizing in the mid‐ to late 40s in 34 of the 38 countries I study. I consider the question of why union membership seems to follow a similar inverted U‐shape pattern in age across countries with such diverse industrial relations systems. I find evidence that this arises in part because of cohort effects, but even when cohort effects are removed a U‐shape remains.     

Einzelbesprechungen

Ohne ZusammenfassungAus dem Italienischen übersetzt von M. St. Braun, WienAus dem Italienischen übersetzt von E. Allina, WienAus dem Russischen übersetzt von A. GerschenkronÜbersetzt von Paul Brüll, Wien.     

Measuring Residential Real Estate Liquidity

There are many factors, other than price alone, that may affect the liquidity of real estate. This study develops a liquidity measure based on the Cox proportional hazard technique, a statistical model widely used in the epidemiologic and social sciences. The odds ratio, along with an estimate of market value for a home, are used to construct a liquidity measure. This measure can extract from the data a rich statistical profile of the variables that affect liquidity.     

The Economics of Charities: Revised Theory and New Evidence

Can economic principles be applied to the behaviour of charities? Professor Edwin West of the Universities of Carleton and Emory, claims that charities are susceptible to the same type of analysis as companies - but with important differences.