We develop a simple Cournot type, two-stage competition model that reveals that firms tend to reduce their R&D investment more in denser locations than in lesser ones with the presence of knowledge spillover. This implies that local agglomeration increases the negative impact of knowledge...

Previous studies on traffic congestion have emphasized supply-side instruments, such as the expansion of road capacity and improving the management of traffic. However, researchers on transportation have identified several paradoxes in which the usual remedy for congestion-expanding the road...