It looks at TSR (Total Shareholder Return) over a 5-year period (2013-2017) across industries.
“The median TSR of the top ten companies in each industry was higher than the industry’s median by 9 percentage points (in insurance) and 32 percentage points (in media and publishing as well as metals).“
“The lesson is this: being in a sector whose market performance is below average is no excuse. TSR is a relative—as well as an absolute—metric, so whether an industry is under pressure or accelerating, every company has the opportunity to outperform its peers.”