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1.
This model combines two important stylized features of volatility, the rough behavior consistent with a Hurst parameter less than , and the regime switching property consistent with more long-term economic considerations. It is nevertheless highly tractable in the sense of semianalytic formulae for European options, and permits a partial Monte Carlo method of similar computational speed as the semianalytic formula (at an appropriate number of Monte Carlo simulations). While option prices are relatively insensitive to the choice of Hurst parameter, introducing rough volatility allows for a better fit to the at-the-money skew. 相似文献
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Virtually No Effect? Different Uses of Classroom Computers and their Effect on Student Achievement 下载免费PDF全文
Oliver Falck Constantin Mang Ludger Woessmann 《Oxford bulletin of economics and statistics》2018,80(1):1-38
Most studies find little to no effect of classroom computers on student achievement. We suggest that this null effect may combine positive effects of computer uses without equivalently effective alternative traditional teaching practices and negative effects of uses that substitute more effective teaching practices. Our correlated random effects models exploit within‐student between‐subject variation in different computer uses in the international TIMSS test. We find positive effects of using computers to look up information and negative effects of using computers to practice skills, resulting in overall null effects. Effects are larger for students with high socioeconomic status and mostly confined to developed countries. 相似文献
5.
Ludger Risse Dipl. Pflegewirt 《Heilberufe》2012,64(1):12-15
Einen akuten und vollst?ndigen Pflegemangel haben wir in Deutschland noch nie erlebt. Das hat nur einen Grund: Beruflich Pflegende
sind gepr?gt von einem hohen Ma? an ethischer Verantwortung, zu Recht liegen sie im Ranking der vertrauenswürdigen Berufe
auf Platz drei. Andere Berufsgruppen zeigen eindrucksvoll, was mit Ausst?nden erreichbar ist, wenn sie nur einen empfindlichen
Nerv der Bev?lkerung treffen und Mangel spürbar wird. 相似文献
6.
School choice research mostly focuses on academic outcomes. Policymakers increasingly view entrepreneurial traits as a non-cognitive outcome important for economic growth. We use international PISA-2006 student-level data to estimate the effect of private-school competition on students’ entrepreneurial intentions, measured by their occupational desire to manage a small enterprise. We exploit Catholic-Church resistance to state schooling in the 19th century as a natural experiment to obtain exogenous variation in current private-school shares. Our instrumental-variable results suggest that a 10%-point higher private-school share raises students’ entrepreneurial intentions by 0.3–0.5% points (11–18% of the international mean) even after controlling for current Catholic shares, students’ academic skills, and parents’ entrepreneurial occupation. 相似文献
7.
Ludger Linnemann 《Fiscal Studies》2010,31(2):227-250
The paper studies the effects of income tax rate changes in a general equilibrium model with frictional unemployment. Laffer curve effects, by which a tax rate reduction may increase the level of government spending or its share in output, are shown to be possible under certain conditions. These are the presence of unemployment benefit payments, government budget balance through fiscal spending adjustment and limited quantitative importance of labour reallocation costs. Endogenous government spending acts as a fiscal accelerator if the fiscal burden of unemployment benefit payments is large, but reduces the employment effects of tax rate cuts if it is low. 相似文献
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Ana Lamo Javier J. Pérez Ludger Schuknecht 《The Scandinavian journal of economics》2012,114(1):228-244
Whether a government acts as a wage leader, placing pressure on private‐sector wages (more open to competition), or whether it plays a passive role and merely follows wage negotiations in the private sector, there are important implications for macroeconomic development, particularly in small open economies and/or countries that are members of a monetary union, such as those of the European Monetary Union. With the notable exception of the case of Sweden, opinion on this issue is still divided. In this paper, we look at public‐ and private‐sector wage interactions from an international perspective (18 OECD countries). We focus on the causal two‐way relationship between public and private wage setting, confirming that the private sector, on the whole, appears to have a stronger influence on the public sector, rather than vice versa. However, we also find evidence of feedback effects from public wage setting, which affect private‐sector wages in a number of countries. When the private sector takes the lead on wages, there are few feedback effects from the public sector, while public wage leadership is typically accompanied by private‐sector feedback effects. 相似文献
9.
The Monge-Kantorovich transportation problem has a long and interesting history and has found a great variety of applications
(see Rachev and Rüschendorf (1998a,b)). Some interesting characterizations of optimal solutions to the transportation problem
(resp. coupling problems) have been found recently. For the squared distance and discrete distributions they relate optimal
solutions to generalized Voronoi diagrams. Numerically we investigate the dependence of optimal couplings on variations of
the coupling function. Numerical results confirm also a conjecture on optimal couplings in the one-dimensional case for nonconvex
coupling functions. A proof of this conjecture is given under some technical conditions.
Received: November 1999 相似文献
10.
Martin Luther urged each town to have a girls' school so that girls would learn to read the Gospel, thereby evoking a surge of building girls' schools in Protestant areas. Using county‐ and town‐level data from the first Prussian census of 1816, we show that a larger share of Protestants decreased the gender gap in basic education. This result holds when using only the exogenous variation in Protestantism due to a county's or town's distance to Wittenberg, the birthplace of the Reformation. Similar results are found for the gender gap in literacy among the adult population in 1871. 相似文献