According to the following article, Softbank will start to give 300,000 yen to those who will score 800 or higher on the TOEIC test to boost the employees' motivation.
http://www.japantoday.com/category/technology/view/softbank-offers-employees-y1-mil-incentive-to-master-english?utm_campaign=jt_newsletter&utm_medium=email&utm_source=jt_newsletter_2013-01-14_AM
This approach may increase their "external" motivation and have some positive effects for a short period.
However, Venom claims that "the rewards can greatly undermine intrinsic motivation."
Choice theory maintains that motivation is intrinsic, and suggests that rewarding to control is considered as "seven deadly habits."
Every leader should consider what kind of reward will boost their employees' "intrinsic" motivation.
I believe that a gift from the heart from employers to employees will be one of the best ways to motivate others intrinsically.