Correlation, or cause and effect?
"'companies with highly engaged workers' grew revenues two-and-a-half times as much as those with low engagement levels"
This comes from a management book, and seems to imply that if you get your workers highly engaged, then your company will grow faster.
But could it not just be the other way round: a company which is growing rapidly is an exciting place to work?
Equally, a company which is flatlining tends to be more obsessed with cost cutting, which doesn't really do much for employee motivation.