Christopher Sung

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Web sites face difficult challenges in supporting successful communities. In this paper we discuss 2 operating web sites, identically designed but with different and distinct audiences. These sites collect user data from site activity and feed it back to the user community in novel ways. The sites are highly active and growing, and have fostered socially(More)
This paper links applications for utility patents between 1985 and 2005 with field trial data on improvements in yields to examine whether citations are a good measure for the size of the " inventive step, " measured as improvements in yield. These data indicate that a large and robust correlation between citations and the size of improvements. In the most(More)
This paper examines whether the US decision during World War I to violate enemy-owned patents-through compulsory licensing-discouraged invention. Estimates from a new data set of German patents indicate a 28 percent increase in invention. Controls for patent quality suggest that only a small share of the increase was due to lower quality, strategic patents.(More)
This paper examines whether the US decision during World War I to violate enemy-owned patents-through compulsory licensing-discouraged invention. Estimates from a new data set of German patents indicate a 28 percent increase in invention. Controls for patent quality suggest that only a small share of the increase was due to lower quality, strategic patents.(More)
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