What does Albert Einstein's famous quote 'If I give you a pfennig you will be one pfennig richer and you will be one pfennig poorer but if I give you an idea you will have an idea' mean?

This quote makes more sense if you correct the typo to read: 'If I give you a pfennig, you will be one pfennig richer and I'll be one pfennig poorer. But if I give you an idea, you will have a new idea, but I shall still have it, too.' Exchanging money makes the giver poorer, but exchanging ideas enriches the receiver without making the giver poorer.