Konjunkturschlaglicht: Deutschland in tiefer Krise

Ohne Zusammenfassung     

Peers and Culture*

We analyze the evolution of culture when parents socialize children to the cultural variants that maximize child lifetime utility. Parents invest in cultural transmission by taking into account that children are also influenced by peers. We model the influence of peers by assuming that children observe different cultural variants in their peer group, assign merit to them and adopt one variant, following a probabilistic adoption rule. We show that cultural diversity is sustainable even if all parents strive to transmit the same variant. We also show that a parental demand for cultural pluralism does not guarantee cultural diversity.     

The demand for relational goods: empirical evidence from the European Social Survey

How are happiness and the demand for relational goods and status goods related? Using cross-sectional data from the European Social Survey, this relationship is investigated for European countries. The main result is that the demand for relational goods is not reduced by high opportunity costs of time. Rather, both wage rate and income are positively related to the frequency of social contacts. In contrast to financial means, while status is more important for happiness in richer European countries than in poorer ones, social status is not decisive for the frequency of meeting friends regardless of the home country’s economic well-being. Thus, while no crowding out of relational contacts by status could be observed, relational goods are even boosted by material well-being.     

China and India in the global economy

The purpose of this overview paper is to present the economic growth in China and India over the last three decades with a specific focus on the integration of these countries into the global economy. In the first part, we briefly review the long-run process of growth and institutional change, emphasizing the reforms leading to the “opening” of the two economies. Then, we focus on key structural features and compare the recent development processes of the two countries. At the end, there are some hints about certain persisting imbalances and the sustainability of the growth processes.     

Exchange-traded funds,persistence in tracking errors and information dissemination

We estimate tracking errors from 26 exchange-traded funds (ETFs) utilizing three different methods and test their relative performance using Jensen's model. We find that tracking errors are significantly different from zero and display persistence. Based on Jensen's alpha, risk adjusted returns are significantly inferior to benchmark returns for all ETFs with two exceptions at conventional significance levels revealing that passive investment strategy does not outperform market returns. We then examine the degree to which frequently used factors such as expense ratio, dividends, exchange rate and spreads of trading prices may be underlying sources of tracking errors causing this underperformance. We find that the change in the exchange rate is a significant source of tracking errors. Our serial correlation test, runs test and panel regression analysis reveal that Asian markets display relatively greater persistence and therefore are less efficient in disseminating information and noisier in filtering the information contained in returns.     

Social Media Metrics — A Framework and Guidelines for Managing Social Media

Social media are becoming ubiquitous and need to be managed like all other forms of media that organizations employ to meet their goals. However, social media are fundamentally different from any traditional or other online media because of their social network structure and egalitarian nature. These differences require a distinct measurement approach as a prerequisite for proper analysis and subsequent management. To develop the right social media metrics and subsequently construct appropriate dashboards, we provide a tool kit consisting of three novel components. First, we theoretically derive and propose a holistic framework that covers the major elements of social media, drawing on theories from marketing, psychology, and sociology. We continue to support and detail these elements — namely ‘motives,’ ‘content,’ ‘network structure,’ and ‘social roles & interactions’ — with recent research studies. Second, based on our theoretical framework, the literature review, and practical experience, we suggest nine guidelines that may prove valuable for designing appropriate social media metrics and constructing a sensible social media dashboard. Third, based on the framework and the guidelines we derive managerial implications and suggest an agenda for future research.     

Ein Test zum Erkennen von Exponentialverteilungen

Zusammenfassung Es wird ein statistisches Testverfahren beschrieben, mit dessen Hilfe nach einer Stichprobennahme entschieden wird, ob es sich bei der betrachteten Verteilung einer Zufallsvariablen um eine Exponentialverteilung handelt oder nicht.

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Summary A statistical test is described which permits to decide, whether the considered distribution of a random variable is an exponential distribution or not.

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Mitteilung aus dem Zentral-Laboratorium der Siemens & Halske AG