HOW MUCH DOES INDUSTRY MATTER, REALLY?
研究了年份、行业、公司母公司和业务特定效应对美国上市公司利润率的影响，发现行业效应解释了19%的利润差异，且在不同经济部门中重要性不同。
In this paper, we examine the importance of year, industry, corporate-parent, and business-specific effects on the profitability of U.S. public corporations within specific 4-digit SIC categories. Our results indicate that year, industry, corporate-parent, and business-specific effects account for 2 percent, 19 percent, 4 percent, and 32 percent, respectively, of the aggregate variance in profitability. We also find that the importance of the effects differs substantially across broad economic sectors. Industry effects account for a smaller portion of profit variance in manufacturing but a larger portion in lodging/entertainment, services, wholesale/retail trade, and transportation. Across all sectors we find a negative covariance between corporate-parent and industry effects. A detailed analysis suggests that industry, corporate-parent, and business-specific effects are related in complex ways. © 1997 by John Wiley & Sons, Ltd.