Lena Mareen Körber

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and the Verein for Sozial Politik for their helpful comments. The authors also thank Larry Christiano, Isabel Correira, and Pedro Teles for their helpful comments. Lena Körber gratefully acknowledges financial support from Cusanuswerk, the ESRC, and the Heinz-Nixdorf Foundation. The views expressed here are the authors' and not necessarily those of the(More)
Recent research has found that the dynamics of the New Keynesian model are very different when the nominal interest rate is zero. Positive technology shocks and negative shocks to the labor tax rate lower economic activity and the size of the government purchase multiplier can be as large as four. We consider the empirical relevance of these dynamics using(More)
This paper develops methodology for semiparametric panel data models in a setting where both the time series and the cross section are large. Such settings are common in finance and other areas of economics. Our model allows for heterogeneous nonparametric covariate effects as well as unobserved time and individual specific effects that may depend on the(More)
Progenitor cells display interesting features for tissue repair and reconstruction. In the last years, such cells have been identified in different cartilage types. In this study, we isolated a migrative subpopulation of adult human nasoseptal chondrocytes with progenitor cell features by outgrowth from human nasal septum cartilage. These putative(More)
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