Research studies indicate that people who are intrinsically motivated as compared to people who are extrinsically motivated tend to:

They tend to work harder and enjoy their work more.
People who are intrinsically motivated are motivated by internal desires - for example, they want to learn a new thing, experience new events, and improve themselves from the inside. On the other hand, people who are extrinsically motivated only want a particular material award, which isn't such a strong drive as internal motivation.

Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.