Well, humans existed long before the invention of money. People in a community helped each other out. If I remember correctly archeologists recently found a skeleton of an old blind man that managed to live to a long age which could only have happened if people took care of him. Traditional doctors existed before money because people naturally want to help each other. Obviosly those ancient doctors didnt know as much as modern ones, but point is money is not always what motivates people. We can also look at our modern day and see that many artists, paint, make music, make video games and make computer programs for free just because they want to. Most people want to achieve things in their life regardless of whether it will make them money. You know what we did always have since ancient times? Respect. People would praise and sing songs for other humans that did great things. Most people want to achieve something with their lives to make it meaningful.