Increases in industry concentration in America over the past century are correlated with greater technological intensity, higher fixed costs and higher output growth, according to Yueran Ma of the University of Chicago Booth School of Business and colleagues.

过去一个世纪美国行业集中度的提高与更高的技术强度， 芝加哥大学布斯商学院的Yueran Ma及其同事表示，更高的固定成本和更高的产出增长有关。