The Transition to Post-industrial BMI Values Among US Children
John Komlos, Ariane Breitfelder, Marco Sunder
NBER Working Paper No. 13898,
No. 13898,
2008
Abstract
In our opinion, the trend in the BMI values of US children has not been estimated accurately. We use five models to estimate the BMI trends of non-Hispanic US-born black and white children and adolescents ages 2-19 born 1941-2006 on the basis of all NHES and NHANES data sets. We also use some historical BMI values for comparison. The increase in BMIZ values during the period considered was on average 1.3σ (95% CI: 1.16σ; 1.44σ) among black girls, 0.8σ for black boys, 0.7σ for white boys, and 0.6σ for white girls. This translates into an increase in BMI values of some 5.6, 3.3, 2.4, and 1.5 units respectively. While the increase in BMI values started among the birth cohorts of the 1940s among black females, the rate of increase tended to accelerate among all four groups born in the mid-1950s to early-1960s with the contemporaneous spread of TV viewing. The rate of increase levelled off somewhat thereafter. There is some indication that among black boys and white girls born after c. 1990 adiposity has remained unchanged or perhaps even declined. The affects of the IT revolution of the last two decades of the century is less evident. Some regional evidence leads to the speculation that the spread of automobiles and radios affected the BMI values of boys already in the interwar period. We infer that the incremental weight increases are associated with the labor-saving technological developments of the 20th century which brought about many faceted cultural and nutritional revolutions.
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The Stability of Bank Efficiency Rankings when Risk Preferences and Objectives are Different
Michael Koetter
European Journal of Finance,
No. 2,
2008
Abstract
We analyze the stability of efficiency rankings of German universal banks between 1993 and 2004. First, we estimate traditional efficiency scores with stochastic cost and alternative profit frontier analysis. Then, we explicitly allow for different risk preferences and measure efficiency with a structural model based on utility maximization. Using the almost ideal demand system, we estimate input- and profit-demand functions to obtain proxies for expected return and risk. Efficiency is then measured in this risk-return space. Mean risk-return efficiency is somewhat higher than cost and considerably higher than profit efficiency (PE). More importantly, rank–order correlation between these measures are low or even negative. This suggests that best-practice institutes should not be identified on the basis of traditional efficiency measures alone. Apparently, low cost and/or PE may merely result from alternative yet efficiently chosen risk-return trade-offs.
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Culture as a Base for Efficient Economic Systems
Ulrich Blum
Wirtschaft im Wandel,
No. 2,
2008
Abstract
Globalization puts the German economic model, the so-called social market economy, under pressure. Constituting elements of this model are fundamental social and economic values. Globalization puts some of these values under pressure and creates inefficiencies because the costs of running the social and economic fabric rise. This is an important justification to inquire into the normative foundations of economic efficiency The following article discusses to what extent culture is a base for efficient economic systems. Information theory is regarded as a key element for explaining social change. The arguments are based on institutional economics with a special view on transaction costs and on cooperation structures. It is shown that specific information technologies promote forms of cooperation, which influence institutional arrangements. The related information technologies themselves are part of the cultural system and its value structures. As a consequence, competition among economic systems favours certain combinations of technologies, cultural arrangements and economic systems. In as much as cultural competition precedes economic competition in the sense of a certain way of thinking, the cultural system can be regarded as a strategic competitive parameter for an economy.
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Does temporary employment influence the workrelated training of low-skilled employees?
Eva Reinowski, Jan Sauermann
IWH Discussion Papers,
No. 2,
2008
Abstract
Fixed-term contracts are considerd as one of the most popular instruments of labour market flexibility. Although they provide new labour market options for employer and employees, it is argued that they may lead to decreasing investments in human capital. From the theoretical point of view it is not clear wheter a fixed-term contract is a drawback for the participation in work-related training. The paper deals with the influence of fixed-term contracts on work-related training especially for low-skilled workers. Based on the Micro Census data of 2004, we estimate a bivariate probit model for the probability of fixed-term employment and participating in work-related training. This model enables us to control for selection effects that may arise from unobservable factors. From the estimation results we can conclude that holding a fixed-term contract does not mean a systematical disadvantage for the training probability of low-skilled employees.
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Is a Centralisation of Local Governmental Structures an Appropriate Way to Ensure an Efficient Provision of Local Public Services? Findings from Case Studies in the State of Saxony-Anhalt
Gerhard Heimpold, Martin T. W. Rosenfeld
Wirtschaft im Wandel,
No. 1,
2008
Abstract
Choosing the appropriate organisational model for local government (i. e. centralised vs. federal model) forms an essential challenge for local communities. Against the background of Fiscal Federalism, a trade-off between the two models mentioned can be expected: Though the centralised model may bring up economies of scale and scope, the federal form of local government may have advantages, too, for instance regarding the extent of civil participation. The article has the intention to answer the question how the degree of centralisation/decentralisation of local governmental organisation affects the provision of services of public interest. The article is based on case studies conducted in ten municipalities located in the State of Saxony-Anhalt, Germany. The government of Saxony-Anhalt intends to implement a reform project targeted at the modernisation of local governmental organisation. The basic reform idea is to transform the local governmental structures from a situation (at the beginning of 2008) where a co-existence of centralised and federally organised municipalities is given towards a future situation where the centralised model should be dominating. In line with the expectation derived from theory, the empirical findings do not draw a picture, which is unequivocally in favour either of the centralised or of the federal model. However, the reform of modernisation of local governmental organisation should remain on the agenda, especially due to a shrinking population in the rural parts of Saxony-Anhalt. This could support the state government’s plans of a more centralized organisation of local government. But this would mean to give up the advantages of the existing federal model of local government. Therefore, in addition to the centralised model favoured by the state government, politicians in Saxony-Anhalt should look for the possibility of an alternative “third” model, which tries to combine the advantages of economies of scale with a greater degree of civil participation.
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Effects of “Democratic Control” on the Efficiency of Local Public Enterprises: Empirical Evidence for Water Suppliers in Eastern Germany
Peter Haug
Public Finance and Management,
No. 1,
2008
Abstract
This paper deals with the effects of interference by local governments on the business affairs of publicly owned utilities. A partial model is presented to illustrate the consequences of “democratic control” on the public managers’ effort and the efficiency of local public production. To empirically check the theoretical results, a two-stage data envelopment analysis (DEA) was carried out on a sample of Eastern German water suppliers. The organizational form is used in the regression analysis to measure the degree of municipal control. The results of the OLS- and Tobit regression indicate an efficiency-enhancing effect on organizational forms with less distinctive control options for local politicians.
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Three methods of forecasting currency crises: Which made the run in signaling the South African currency crisis of June 2006?
Tobias Knedlik, Rolf Scheufele
IWH Discussion Papers,
No. 17,
2007
Abstract
In this paper we test the ability of three of the most popular methods to forecast the South African currency crisis of June 2006. In particular we are interested in the out-ofsample performance of these methods. Thus, we choose the latest crisis to conduct an out-of-sample experiment. In sum, the signals approach was not able to forecast the outof- sample crisis of correctly; the probit approach was able to predict the crisis but just with models, that were based on raw data. Employing a Markov-regime-switching approach also allows to predict the out-of-sample crisis. The answer to the question of which method made the run in forecasting the June 2006 currency crisis is: the Markovswitching approach, since it called most of the pre-crisis periods correctly. However, the “victory” is not straightforward. In-sample, the probit models perform remarkably well and it is also able to detect, at least to some extent, out-of-sample currency crises before their occurrence. It can, therefore, not be recommended to focus on one approach only when evaluating the risk for currency crises.
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A Simple Representation of the Bera-Jarque-Lee Test for Probit Models
Joachim Wilde
IWH Discussion Papers,
No. 13,
2007
Abstract
The inference in probit models relies on the assumption of normality. However, tests of this assumption are not implemented in standard econometric software. Therefore, the paper presents a simple representation of the Bera-Jarque-Lee test, that does not require any matrix algebra. Furthermore, the representation is used to compare the Bera-Jarque- Lee test with the RESET-type test proposed by Papke and Wooldridge (1996).
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Optimizing knowledge transfer by new employees in companies
Sidonia vonLedebur
Knowledge Management Research and Practice,
No. 4,
2007
Abstract
Companies realize innovations by creating and implementing new knowledge. One possible source of innovative ideas are new employees. Based on an existing game-theoretic model the conditions of efficient knowledge transfer in a team are analyzed. Offering knowledge to a colleague cannot be controlled directly by the company due to information asymmetries. Thus the management has to provide incentives, which motivate the employees to act in favor of the company. The aim of this paper is to show what influences the propensity of the employees to engage in knowledge transfer and how the management can design the incentive structure for optimal transfer. Several factors are relevant, especially the individual costs of participating in the transfer. These consist mainly of the existing absorptive capacity and the working atmosphere. The model is at least partly generalized on more players. The relevance of the adequate team size is shown: too few or too many developers decrease the remaining company profit. A further result is that depending on the cost structure, perfect knowledge transfer is not always best for the profit of the company.
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The Role of the Human Capital and Managerial Skills in Explaining the Productivity Gaps between East and West
Wolfgang Steffen, Johannes Stephan
IWH Discussion Papers,
No. 11,
2007
Abstract
This paper assess determinants of productivity gaps between firms in the European transition countries and regions and firms in West Germany. The analysis is conducted at the firm level by use of a unique database constructed by field work. The determinants tested in a simple econometric regression model are focussed upon the issue of human capital and modern market-oriented management. The results are novel in as much as a solution was established for the puzzling results in related research with respect to a comparison of formal qualification between East and West. Furthermore, the analysis was able to establish that the kind of human capital and expertise mostly needed in the post-socialist firms are related to the particular requirements of a competitive marketbased economic environment. Finally, the analysis also finds empirical support for the role of capital deepening in productivity catch-up, as well as the case that the gaps in labour productivity are most importantly rooted in a more labour-intense production, which does not give rise to a competitive disadvantage.
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