It depends if he/she is open minded. If not, you might want to drop it. I now go by the words of Plank, the physicist. He said a new idea does not win because you convince the people against it, but because the old school dies out, and the new people only know the new idea. If the banker is curious and open minded, I would good with the Internet of Money by Antonopoulos. all the content in that book can also be found on his videos on YouTube. In fact I think Antonopoulos speaks better about the economy than bankers. Bitcoin standard is also good