International Convergence of Copyright Production
研究了各国版权材料生产差异及其随时间变化，提出一个版权与公共领域的动态模型，预测人均版权生产存在条件趋同，并用1975-1995年图书和电影数据验证了版权贫乏国家增长更快。
The production of copyrighted materials varies widely across countries, and how it evolves over time has important policy implications. I propose a simple dynamic model of copyrights and the public domain, which predicts conditional convergence of per capita copyright production among countries. Using book and film production data for the period 1975 to 1995, I test and confirm the model's prediction that copyright-poor countries tend to grow faster than copyright-rich countries in terms of per capita copyright production. © 2011 The President and Fellows of Harvard College and the Massachusetts Institute of Technology.