Today, a CEO can turn in a few quarters of really solid earnings growth, they can earn enough to retire to a life a private jets. Back when CxO pay was lower, the only way to make that kind of bank was to claw your way into the top job and stay there for a decade or more.
The current situation strongly incentivizes short-term thinking.
With today's very high, option-heavy compensation a CEO making long-term investments in the company rather than cutting staff and doing stock buybacks is taking money out of his own pocket.
It's a perverse incentive.