ignorance if telephone numbers no longer identify networks. As a result, while fostering competition for mobile customers, MNP … carrier identification affect these findings. -- number portability ; switching costs ; telecommunications ; network … competition …

measures of California air pollution indicators, including CO, NO2, SO2, O3, PM10, and PM2.5 concentrations. We employ two … outcomes and political variables for California. The popular belief is empirically supported only for NO2 and O3, but not for …

We investigate the relationships between water quality and socioeconomic factors in California at the county level for … determinant of water quality in California, but for other surface water pollutants commonly considered agricultural pollutants …