The short answer is: It depends
As explained in this video by Dan Pink the author of Drive: The Surprising Truth About What Motivates Us.
What motivates people to work are three factors:
These three are mentioned too in the book Outliers: The Story Of Success by Malcolm Gladwell.
Disclaimer: Amazon link contains our affiliate link http://halalbuzz.com/Amazon. But that book is great and it was a bestselling book.