Pay Them By The Hour

Or how to get your employees out of a slump:

If someone sees their time as having a financial worth, then it follows that any time they don't spend earning money is essentially lost revenue. DeVoe and Pfeffer found that of over 10,000 employees, those who were paid by the hour were significantly more likely to say that, given the choice, they would choose to work more hours for more money, rather than fewer hours for less money.