After reading the sources I would say there is evidence that employees in the survey they conducted self reported better financial performance from the following options:
"how would you compare your organization’s performance
over the past two years in terms of
market share? .|.|. Would you say that it was (1)
much worse, (2) somewhat worse, (3) about the
same, (4) somewhat better, or (5) much better?”
"how would you compare your organization’s performance over the past two years in terms of market share? .|.|. Would you say that it was (1) much worse, (2) somewhat worse, (3) about the same, (4) somewhat better, or (5) much better?”
Surely we can be more factual than this?