An Empirical Analysis of Returns on Invested Capital  149 In several industries, there was a clear downward trend in returns. These included trucking, health care facilities, and automobiles. Competition in trucking, advertising, and automobiles has increased substantially over the past five decades. Health-care facilities have had their prices squeezed by the government, insurers, and competition with nonprofits. Industries where returns on invested capital clearly are trending up are rare. Examples are health-care equipment, airlines, and aerospace and defense. Innovation in health-care equipment has enabled the industry to produce higher-value-added, differentiated products such as artificial joints, as well as more commoditized products, including syringes and forceps. As mentioned earlier, the U.S. airlines industry benefited from consolidation, and companies in aerospace and defense reduced their capital intensity as governments pro- vided up-front funding for many more contracts. There is similar evidence of sustained rates of return at the company level. We measured the sustainability of company ROIC in our database of nonfi- nancial corporations by ranking companies based on their ROIC in each year and dividing the group into quintiles. We treated each quintile as a portfolio and tracked the median ROIC for the portfolio over the following 15 years, as shown in Exhibit 8.10. The results indicate some mean reversion: compa- nies earning high returns tended to see their ROIC fall gradually over the succeeding 15 years, and companies earning low returns tended to see them rise over time. Only in the portfolio containing companies generating returns between 5 and 10 percent (mostly regulated companies) do rates of return EXHIBIT 8.10  ROIC Decay Analysis Median ROIC of portfolios (without goodwill), by quintile,1 % 0 5 10 15 20 25 30 35 0 1 3 5 7 9 2 4 6 8 10 11 12 13 14 15 Number of years following portfolio formation 1 At year 0, companies are grouped into one of five portfolios, based on ROIC. Source: Corporate Performance Analytics by McKinsey. 150 RetuRn on Invested CapItal EXHIBIT  8.11 ROIC Decay through Economic Crisis and Recovery Median ROIC of portfolios (excluding goodwill), by 2003 quartile,1 % 0 5 10 15 20 30 40 50 45 35 25 2005 2010 2015 1 As of 2003, companies are grouped into quartiles, based on ROIC. Source: Corporate Performance Analytics by McKinsey. remain constant. However, an important phenomenon is the persistence of superior performance beyond ten years. The returns of the best-performing companies do not decline all the way to the aggregate median over 15 years. High-performing companies are in general remarkably capable of sustaining a competitive advantage in their businesses and/or fi nding new business where they continue or rebuild such advantages. The pattern is stable over time— even over the most recent 15 years, which included the 2008 credit crisis (see Exhibit 8.11 ). Since a company’s continuing value is highly dependent on long-run fore- casts of ROIC and growth, this result has important implications for corporate valuation. Basing a continuing value on the economic concept that ROIC will approach the weighted average cost of capital (WACC) is overly conservative for the typical company generating high ROIC. (Continuing value is the focus of Chapter 14.) Keeping this range of performance in mind, it is important when bench- marking the historical decay of company ROIC to segment results by industry, especially if industry is a proxy for sustainability of competitive advantage. As an example, Exhibit 8.12 plots the ROIC decay rates for branded consumer goods, again sorting the companies into fi ve portfolios based on their starting ROICs. Here, the top-performing companies don’t show much reversion to the mean. Even after 15 years, the original class of best performers still outper- forms the bottom quintile by more than 13 percentage points. an empIRICal analysIs of RetuRns on Invested CapItal 151 Although decay rates examine the rate of regression toward the mean, they present only aggregate results and tell us nothing about the spread of poten- tial future performance. Does every company generating returns greater than 20 percent eventually migrate to 15 percent, or do some companies actually go on to generate higher returns? Conversely, do some top performers become poor performers? To address this question, we measured the probability that a company will migrate from one ROIC grouping to another in ten years. The results are presented in Exhibit 8.13 . Read each row from left to right. EXHIBIT  8.12 ROIC Decay for Branded Consumer Goods Median ROIC of portfolios (without goodwill), by quintile,1 % 0 5 10 15 20 25 30 35 0 1 3 5 7 9 2 4 6 8 10 11 12 13 14 15 Number of years following portfolio formation 1 At year 0, companies are grouped into one of five portfolios, based on ROIC. Source: Corporate Performance Analytics by McKinsey. EXHIBIT  8.13 ROIC Transition Probability Probability of achieving ROIC in 2017, % ROIC in 2017, %1 ROIC in 2007 , %1 74 40 15 <15 >25 15–25 <15 17 32 14 70 15–20 9 28 >25 1 ROIC excluding goodwill. Source: Corporate Performance Analytics by McKinsey.