The authors point out that state tax systems have become more regressive in the past decade. Taxes in many states have become relatively more burdensome to low- and moderate-income families and relatively less burdensome on the affluent than they were before the last recession, the authors say....

New streams of data are being generated by a range of in-situ instrumentation, mobile sensing, and social media that can be integrated and analyzed to better understand urban activity and mobility patterns. While several studies have focused on understanding activity patterns and flows of people...

Most emergency medical services (EMS) systems send patients to the closest hospitals. This long-standing principle, while maximizing patient welfare in usual times, can lead to hospital overloading and negative patient outcomes during unusual EMS demand shifts caused by events such as the...