https://lifehacker.com/the-complex-relationship-between-happiness-and-motivati-1623287744
Happy people are more productive.
Happiness and positive interactions can have a great impact on daily productivity in the office.
In the end, motivation and productivity don't depend as much on happiness as they do on positive thinking. Positive thinking will keep you glued to the task at hand when the going gets hard, and anticipation of success is likely to bring about success.