Although efforts to relieve state tax burdens on poor families are not new, the nature of such tax relief changed in the 1990s. In previous decades, tax relief focused on sales or property taxes. More recently, states have enacted refundable income tax credits, particularly work-related...

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...