Exploring the Causes of Frictional Wage Dispersion

Standard search models are inconsistent with the amount of frictional wage dis- persion found in U.S. data. We resolve this apparent puzzle by modeling skill development (learning by doing on the job, skill loss during unemployment) and duration dependence in unemployment benets in a random on the job search model featuring two-sided heterogeneity. The model's key parameters are calibrated using micro data on employment mobility and wages from the Survey of Income and Program Participation (SIPP). Our model is consistent with the amount of frictional wage dispersion found in the data. Skill develop- ment on the job is the most important driver behind this result. Meanwhile, firm heterogeneity never accounts for more than 20% of overall wage inequality within an age cohort.Frictional wage dispersion; Search model; Heterogeneity

Foreign Customer Accumulation and Export Dynamics

I present a dynamic fixed cost model of export participation extended by a capital theoretic concept of the customer stock. Plants that want to start exporting have to invest into a market specific factor which serves as input into a decreasing returns to scale technology generating sales demand. Customer capital, like phyical capital, depreciates over time and its accumulation is subject to adjustment costs. It allows the model to reproduce the empirical fact that new exporters show above average revenue growth rates and a declining exit hazard in the years after entry. I structurally estimate the model on a rich panel data set of German manufacturing plants between 1995 and 2008. During the observed time span, plants in the sample saw a strong increase in export activity which provides a suitable case study for the predictive power of the model. Unlike a pure fixed cost version, the model correctly forecasts a steep rise in exports after 2003. It is also able to reconcile a strong export reaction to trade liberalizations with a low elasticity of aggregate exports to exchange rate movements. Customer capital accumulation therefore offers a potential resolution to the elasticity puzzle in international economics

On Guichard's nets and Cyclic systems

In the first part, we give a self contained introduction to the theory of cyclic systems in n-dimensional space which can be considered as immersions into certain Grassmannians. We show how the (metric) geometries on spaces of constant curvature arise as subgeometries of Moebius geometry which provides a slightly new viewpoint. In the second part we characterize Guichard nets which are given by cyclic systems as being Moebius equivalent to 1-parameter families of linear Weingarten surfaces. This provides a new method to study families of parallel Weingarten surfaces in space forms. In particular, analogs of Bonnet's theorem on parallel constant mean curvature surfaces can be easily obtained in this setting.Comment: 25 pages, plain Te

On the origin and application of the Bruggeman correlation for analysing transport phenomena in electrochemical systems

The widely used Bruggeman equations correlate tortuosity factors of porous media with their porosity. Finding diverse application from optics to bubble formation, it received considerable attention in fuel cell and battery research, recently. The ability to estimate tortuous mass transport resistance based on porosity alone is attractive, because direct access to the tortuosity factors is notoriously difficult. The correlation, however, has limitations, which are not widely appreciated owing to the limited accessibility of the original manuscript. We retrace Bruggeman's derivation, together with its initial assumptions, and comment on validity and limitations apparent from the original work to offer some guidance on its use

Welcome to iLEAD: An Introduction to Intercultural Communication for Intensive English Program Students

Presentation introduces participants to the rationale, curriculum, and outcomes of the iLEAD intercultural communication program

A Handbook and Materials for iLEAD: An Intercultural Communication Program Between Intensive English Program and Teacher Education Students

iLEAD is an intercultural communication program for university students that focuses on developing intercultural competence through guided conversations and shared activities. iLEAD stands for “International Language Exchange and Dialogue.” It was developed through a partnership between the Intensive English Program and the Department of Teacher Education at the University of Dayton. The educational context: There is a stark difference in how domestic and international students experience the university. The majority of university students fit into the description of traditional, residential students. However, many international students do not fit the traditional, residential student demographic. Many of our international students who come from Middle Eastern countries are married, have children, and are pursuing graduate degrees. In addition, many international students who are pursuing undergraduate degrees request exemptions to live off campus, which further separates them from interaction with their American peers. Consequently, many of them do not experience the same integrated learning experience that residential university students receive. With international students making up 13% of the university’s 10,828 students in 2016, the need for meaningful interactions between these diverse populations in an effort to build community across difference continues to increase. The iLEAD program responds to this growing need In addition, the iLEAD programs builds toward specific student learning outcomes