Phase transition in the S&P stock market

We analyze the returns of stocks contained in the Standard & Poor’s 500 index from 1987 until 2011. We use covariance matrices of the firms’ returns determined in a time windows of several years. We find that the eigenvector belonging to the leading eigenvalue (the market) exhibits a phase transition. The market is in an ordered state from 1995 to 2005 and in a disordered state after 2005. We can relate this transition to an order parameter derived from the stocks’ beta and the trading volume. This order parameter can also be interpreted within an agent-based model.     

Trading the forward bias: Are there limits to speculation?

In this paper we investigate whether trading the forward bias allows for economically significant excess returns. We find that bias-trading strategies can be viewed as attractive investment opportunities per se, useful diversification devices, and promising portfolio extensions for active fund managers trying to beat their benchmarks. The empirical results, which also mirror the problems arising in attempts to explain the puzzle by risk-premia, are consistent with market evidence that the bias is traded in practice. Overall, our findings suggest that limits to speculation are unlikely to provide a (stand-alone) explanation for the persistence of the forward bias.     

Running for pleasure or performance? How store attributes and hedonic product value influence consumer satisfaction

Previous retailing studies have linked consumer satisfaction to perceived hedonic or utilitarian product value. This research extends previous studies by examining how the context in which the product is purchased (store attributes) and product value influence consumer satisfaction. We conducted a field study with 213 consumers attending two major running events. The findings from structural equation modelling suggest that a specific combination of store attributes (tangible and intangible) and hedonic product value has a positive influence on satisfaction. Results also show that tangible store attributes have a stronger positive impact on utilitarian (vs. hedonic) product value, and that intangible store attributes have a positive impact on hedonic product value. However, we found that only hedonic product value has a positive impact on satisfaction. This research contributes to theory by showing that a match between store attributes (tangible and intangible) and hedonic product value can positively influence satisfaction. In managerial terms, the findings provide insights on how to improve consumer satisfaction in retail environments through store attributes and hedonic product value.     

The development of new higher education courses

The main objective of this study was to present a proposal for a model explaining the construction of a new higher education course to be offered to the market. Having quite a limited theoretical basis and with few investigations dealing with innovation in educational services, a case study was made to help in construction of the model. The case study, supported by studies found and adaptation of innovation in services to the educational sector, made construction of the model possible, and this is divided in three stages: antecedents, development, and implementation of the new higher education course. The proposed model can be useful for managers of higher education institutes when they decide to put new courses on the market. As for the academic field, the study presented attempts to clarify the phenomenon, as well as showing the need for further research into the subject.     

Acquisition through innovation tournaments in high-tech industries: a comparative perspective

Acquisition of innovative firms is a widely observed phenomenon in high-tech industries. On the basis of distinct advantages of large and small firms, in this paper, we build a tournament model with possible acquisition activity of large firms to derive hypotheses on interdependencies between acquisition frequency and post-acquisition success rates. We find empirical support for our hypotheses that (1) acquisitions increase overall innovation output and (2) that the number of acquisitions is higher in industries with larger heterogeneity between established firms and young start-ups. However, our third hypothesis derived from the formal model that innovation success following from acquisitions varies across industries is only partially confirmed.     

Product diversification and stability of employment and sales: first evidence from German manufacturing firms

In this study, we use a unique rich newly built data set for German manufacturing enterprises to investigate the relationship between product diversification and the stability of sales and employment. We find that contrary to portfolio theoretic considerations, more diversified firms exhibit a higher variability of sales and employment. However, the effects are negligibly small from an economics point of view.     

Credit constraints and margins of import: first evidence for German manufacturing enterprises

This study uses tailor-made enterprise-level data for 2008–2010 from various sources for firms from manufacturing industries to test for the link between credit constraints, measured by a credit rating score provided by a leading credit rating agency, and imports in Germany for the first time. We find empirical evidence that a better credit rating score is positively related to extensive margins of import – firms with a better score have a higher probability to import, they import more goods and they source from more countries of origin. The intensive margin of imports – the share of imports in total sales – is found not to be related to credit constraints.     

Gesetzliche Mindestlöhne: mit der Einführung kommen die Tücken der Umsetzung

Looking around the world, one realizes that national minimum wages are not uncommon. Yet it is still very difficult to estimate what effects a minimum wage might have in Germany. This is not just a question of how high the minimum wage should be — its impacts would also depend on many details of practical implementation. The present article addresses these issues.     

Ungleiche Verteilung der Einkommen bremst das Wirtschaftswachstum

In Germany in the last decade, corporate incomes have increased much more sharply than private household incomes. At the same time, the inequality of household incomes has increased. High-income households have profited particularly from investment income and self-employment. The income gap has not widened further in recent years, but the high level of inequality already reached in 2005 has resulted in a sustained reduction of consumer spending. What is needed now is a level of income and wealth distribution that will strengthen domestic demand.