LEARNING‐BY‐DOING AND MARKET STRUCTURE*
利用Olley-Pakes估计法测算美国制造业250多个行业的干中学速率，并发现高学习行业的企业集中度下限更高，表明干中学具有内生沉没成本特征。
Applying the Olley‐Pakes estimation technique to an augmented production function, we estimate rates of learning‐by‐doing in over 250 SIC4 industries in the U.S. manufacturing sector. We then examine the link between learning and producer concentration using Sutton's bounds approach. We find that the lower bound of concentration is higher in high‐learning industries, which suggests that learning‐by‐doing has characteristics of an endogenous sunk cost.