The fundamental differences between the two samples is that in sample B the non-industry variances are substantially larger, making industry relatively less important. Whereas the industry and industry-year components are comparable in both samples, in sample B business-unit variance component is 40 percent larger than in sample A and the residual error is 80 percent larger. (The corporate variance component is three times as large but its magnitude is small in both samples.) If the components are expressed as percentages, the opposite pattern emerges: the contribution of industry falls from 8.29 percent in sample A to 4.01 percent in sample B, whereas the percentage contribution of the business-unit component is virtually unchanged