It's good to reward someone for doing good work.
Christopher got promoted to manager at his job on a trial basis.
Christopher wants his employee's to do a good job under his leadership.
Christopher rewarded the top performing employees with gift cards.
Christopher yelled at one of his poorly performing employee's in front of the entire team.
Everyone on the team wanted to earn their own gift cards and started working harder.
The other employee's started resenting him and performing more poorly causing him to lose his management position.