33 research outputs found
Application of network traffic flow model to road maintenance
The study shows how the evolution of two-way traffic flows on a local highway network can be predicted over time using a network-level traffic flow model (NTFM) to model both urban and motorway road networks. After a brief review of the main principles of the NTFM and its associated sub-models, the paper describes how a maintenance worksite can be modelled using a roadwork-node sub-model and a network solution routine in the NTFM. In order to model the two-way traffic flow in the road network, an iterative simulation method is used to generate the evolution of dependent traffic flows and queues. The NTFM has been applied to model the traffic characteristics and the effects of maintenance activities on the local Loughborough–Nottingham highway network. The study has demonstrated that the methodology is useful in selecting various worksite arrangements in order to reduce the effects of maintenance on road users
Do higher corporate taxes reduce wages? : Micro evidence from Germany
Because of endogeneity problems very few studies have been able to identify
the incidence of corporate taxes on wages. We circumvent these problems
by using an 11-year panel of data on 11,441 German municipalities' tax
rates, 8 percent of which change each year, linked to administrative matched
employer-employee data. Consistent with our theoretical model, we find a
negative effect of corporate taxation on wages: a 1 euro increase in tax liabilities
yields a 77 cent decrease in the wage bill. The direct wage effect, arising
in a collective bargaining context, dominates, while the conventional indirect
wage effect through reduced investment is empirically small due to regional labor
mobility. High and medium-skilled workers, who arguably extract higher
rents in collective agreements, bear a larger share of the corporate tax burden
Exporting and labor demand : micro-level evidence from Germany
It is widely believed that globalization affcts the extent of employment and
wage responses to economic shocks. To provide evidence for this, we analyze
the effect of firms' exporting behavior on the elasticity of labor demand. Using
rich, German administrative linked employer-employee panel data from 1996
to 2008, we explicitly control for self-selection into exporting and endogeneity
concerns. In line with our theoretical model, we find that exporting at both
the intensive and extensive margins significantly increases the (absolute value
of the) unconditional own-wage labor demand elasticity. This is not only true
for the average worker, but also for different skill groups. For the median
firm, the elasticity is three-quarters higher when comparing exporting to nonexporting
firms