Closing the Technology Gap Under Protection
研究贸易保护如何影响受保护企业采用新技术的速度，区分永久性与临时性保护、关税与配额的不同效果，发现永久关税加速技术采用，而永久配额除非高度限制性否则延迟采用，临时保护则总是延迟技术采用。
This paper explores the linkage between protection and the speed with which a protected firm adopts new technology. Of primary importance here is the distinction between permanent and temporary protection on the one hand, and between tariffs and quotas on the other. The authors find that a permanent tariff speeds up adoption but a permanent quota delays adoption unless the quota is highly restrictive. However, temporary protection (i.e., protection that remains effective until the firm adopts new technology) always delays the timing of technology adoption. Copyright 1995 by American Economic Association.