@article{Hummels:330896,
      recid = {330896},
      author = {Hummels, David and Klenow, Peter J.},
      title = {The Quality and Variety of a Nation's Exports},
      address = {2001},
      pages = {34},
      year = {2001},
      note = {Presented at the 4th Annual Conference on Global Economic  Analysis, Purdue University, USA},
      abstract = {Using 1990 data on U.S. imports from 119 countries in  14,572 product categories, we find that richer countries  and countries with more workers export to the U.S. in many  more categories. Within categories, richer countries export  modestly fewer units at considerably higher unit prices,  suggesting they are exporting higher quality products. If  exports to the U.S. are representative of exporter  production, then the estimates imply that one-half of  country differences in income per worker arise from  differences in the quality of goods produced. We find  further that countries with more workers export greater  quantities per category at no lower unit prices. This last  finding coincides with Krugman-style models of  differentiated products subject to fixed costs of  production, and appears inconsistent with Armington-style  models with a fixed number of country-specific varieties.},
      url = {http://ageconsearch.umn.edu/record/330896},
}