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This study examines the ethnic identity of authors in over 2.5 million scientific papers written by US-based authors from 1985 to 2008, a period in which the frequency of English and European names among authors fell relative to the frequency of names from China and other developing countries. We find that persons of similar ethnicity co-author together more frequently than predicted by their proportion among authors. Using a measure of homophily for individual papers, we find that greater homophily is associated with publication in lower impact journals and with fewer citations, even holding fixed the authors' previous publishing performance. By contrast, papers with authors in more locations and with longer reference lists get published in higher impact journals and receive more citations than others. These findings suggest that diversity in inputs by author ethnicity, location, and references leads to greater contributions to science as measured by impact factors and citations. The globalization of science has changed the ethnic and national origin of USbased scientists and engineers (Freeman 2006). From the mid-1970s to the 2000s the foreign-born proportion of science and engineering PhDs granted by US universities roughly doubled, increasing the supply of foreign-born persons to US-based science as research assistants during their PhD studies and as post-doctoral workers afterward (Bound et al. 2009; Franzoni et al. 2012; Stephan 2012). Expansion of doctorate science and engineering education worldwide increased the supply of potential non-US educated immigrant scientists and engineers to US-based science as well (Borjas and Doran 2013). These developments substantially changed the ethnic composition of the scientists and engineers who produce scientific papers in the US. In 1985 about 57% of authors on papers in the Web of Science (WoS) with US addresses had "English" names, 13% had European names while 30% had names of other ethnic groups. The proportion of authors with English names dropped below 50% in 1994 and continued falling to 46% in 2008. By contrast, the proportion of Chinese named authors increased substantially, as did the proportion of authors with names associated with Indian, Hispanic/ Filipino, Russian, and Korean ethnicity. In 2008 14% of the names on papers written in the US had Chinese names and 8% had Indian/Hindi/South Asian names. Given the increasingly collaborative nature of science (Wuchty et al. 2007), it is natural to ask whether newly emergent groups of primarily foreign-born researchers work disproportionately with persons of their ethnicity, producing homophily in co-authorship

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Chinese housing prices rose by over 10 percent per year in real terms between 2003 and 2014 and are now between two and ten times higher than the construction cost of apartments. At the same time, Chinese developers built 100 billion square feet of residential real estate. This boom has been accompanied by a large increase in the number of vacant homes, held by both developers and households. This boom may turn out to be a housing bubble followed by a crash, yet that future is far from certain. The demand for real estate in China is so strong that current prices might be sustainable, especially given the sparse alternative investments for Chinese households, so long as the level of new supply is radically curtailed. Whether that happens depends on the policies of the Chinese government, which must weigh the benefits of price stability against the costs of restricting urban growth.