Armut im Alter – Ursachenanalyse und eine Projektion für das Jahr 2023
Ingmar Kumpmann, Michael Gühne, Herbert S. Buscher
Abstract
Verschiedene Faktoren bewirken eine Zunahme der Altersarmut in Deutschland, insbesondere in Ostdeutschland. Mit Daten des Sozio-oekonomischen Panel (SOEP) untersuchen wir Ursachen und Ausmaß der Altersarmut in Deutschland. Wir beginnen mit einer Querschnittsregression zur Bestimmung der Einflussfaktoren der Alterseinkommen. Im zweiten Schritt nehmen wir eine Projektion der Einkommen der 50- bis 55-Jährigen des Jahres 2008 für das Jahr 2023 vor. Dabei berücksichtigen wir sämtliche Einkommensarten, einschließlich verschiedener Formen von Kapitaleinkünften und des Wohnwerts selbst genutzten Wohneigentums. Es zeigt sich, dass, verglichen mit der heutigen alten Generation, vor allem in Ostdeutschland das Armutsrisiko steigt. Dies ist auf den Wandel der Erwerbsbiografien in der Folge der deutschen Vereinigung zurückzuführen.
Artikel Lesen
Has the Euro Increased International Price Elasticities?
Oliver Holtemöller, Götz Zeddies
IWH Discussion Papers,
Nr. 18,
2010
publiziert in: Empirica
Abstract
This paper analyzes the role of common data problems when identifying structural breaks in small samples. Most notably, we survey small sample properties of the most commonly applied endogenous break tests developed by Brown, Durbin, and Evans (1975) and Zeileis (2004), Nyblom (1989) and Hansen (1992), and Andrews, Lee, and Ploberger (1996). Power and size properties are derived using Monte Carlo simulations. Results emphasize that mostly the CUSUM type tests are affected by the presence of heteroscedasticity, whereas the individual parameter Nyblom test and AvgLM test are proved to be highly robust. However, each test is significantly affected by leptokurtosis. Contrarily to other tests, where skewness is far more problematic than kurtosis, it has no additional effect for any of the endogenous break tests we analyze. Concerning overall robustness the Nyblom test performs best, while being almost on par to more recently developed tests in terms of power.
Artikel Lesen
Testing for Structural Breaks at Unknown Time: A Steeplechase
Makram El-Shagi, Sebastian Giesen
Abstract
This paper analyzes the role of common data problems when identifying structural breaks in small samples. Most notably, we survey small sample properties of the most commonly applied endogenous break tests developed by Brown, Durbin, and Evans (1975) and Zeileis (2004), Nyblom (1989) and Hansen (1992), and Andrews, Lee, and Ploberger (1996). Power and size properties are derived using Monte Carlo simulations. Results emphasize that mostly the CUSUM type tests are affected by the presence of heteroscedasticity, whereas the individual parameter Nyblom test and AvgLM test are proved to be highly robust. However, each test is significantly affected by leptokurtosis. Contrarily to other tests, where skewness is far more problematic than kurtosis, it has no additional effect for any of the endogenous break tests we analyze. Concerning overall robustness the Nyblom test performs best, while being almost on par to more recently developed tests in terms of power.
Artikel Lesen
Regional Entrepreneurial Opportunities in the Biotech Industry: Exploring the Transition from Award-winning Nascent Entrepreneurs to Real Start-ups
H. Wolf, Claus Michelsen, Michael Schwartz
Abstract
Knowledge of factors that determine the transition from nascent entrepreneurship into real entrepreneurship is of major importance for policies aiming to effectively stimulate start-ups. Whereas scholars concentrated on person-specific factors to explain transition probabilities, environmental characteristics have been fairly neglected. Given that entrepreneurship is a strongly localized phenomenon, this paper argues that regional entrepreneurial opportunities are a driving force behind the transition from nascent entrepreneurship to new venture creation. Based on unique data on 103 nascent entrepreneurs in the German biotechnology industry, we empirically assess the importance of regional entrepreneurial opportunities on transition probabilities. Further, we introduce a new
approach to measure nascent entrepreneurship by capturing individuals that actively participate in start-up competitions and have won at least one competition. Controlling for technology and individual characteristics, we find strong support for our hypotheses relating to the significant impact of general regional opportunities, specific regional opportunities and the entrepreneurial environment for the probability of transition from award-winning nascent entrepreneurs to real start-ups.
Artikel Lesen
The Financial Crisis from a Forecaster’s Perspective
Katja Drechsel, Rolf Scheufele
Abstract
This paper analyses the recession in 2008/2009 in Germany, which is very different from previous recessions, in particular regarding its cause and magnitude. We show to what extent forecasters and forecasts based on leading indicators fail to detect the timing and the magnitude of the recession. This study shows that large forecast errors for both expert forecasts and forecasts based on leading indicators resulted during this recession which implies that the recession was very difficult to forecast. However, some leading indicators (survey data, risk spreads, stock prices) have indicated an economic downturn and hence, beat univariate time series models. Although the combination of individual forecasts provides an improvement compared to the benchmark model, the combined forecasts are worse than several individual models. A comparison of expert forecasts with the best forecasts based on leading indicators shows only minor deviations. Overall, the range for an improvement of expert forecasts during the crisis compared to indicator forecasts is relatively small.
Artikel Lesen
Knowledge Transfer to MNE Subsidiaries in Central and East Europe - Integrating Knowledge-based and Organisational Perspectives: An Introduction, Special Edition
Johannes Stephan, Björn Jindra
East-West Journal of Economics and Business,
1 & 2
2005
Abstract
Artikel Lesen
Industry Level Technology Gaps and Complementary Knowledge Stocks as Determinants of Intra-MNC Knowledge Flows
Björn Jindra, Johannes Stephan
East-West Journal of Economics and Business,
1 & 2
2005
Abstract
Pursuing a subsidiary level analysis, we this paper tests the ‘technology gap’ hypothesis in the context of intra-MNC knowledge flows. Furthermore, it introduces complementary knowledge stocks into the concept of absorptive capacity. A set of hypotheses is tested in sample 434 foreign subsidiaries based in Central and East Europe. We find partial support for the ‘technology gap’ hypothesis applied at industry level. Furthermore, subsidiaries’ complementary knowledge stocks increase the probability for corresponding knowledge inflows from the foreign parent.
Artikel Lesen
