MARKET SIZE AND INTELLECTUAL PROPERTY PROTECTION*
定量评估当前知识产权政策，指出随着市场规模因经济增长或贸易扩张而增大，知识产权保护应减弱。
Intellectual property (IP) protection involves a trade‐off between the undesirability of monopoly and the desirable encouragement of creation and innovation. Optimal policy depends on the relative strength of these two forces. We give a quantitative assessment of current IP policies. We focus particularly on the scale of the market, showing that as it increases, due either to growth or to the expansion of trade, IP protection should be reduced.