It is finite in that it takes energy to extract it, it takes a huge network of transportation that runs on said energy to keep the process running. It is finite in that sense. The petrodollar had nefarious origins however you cannot deny that money represents energy. The money you get for goods and services means you're trading dollars for energy expended to create the goods, or provide the service. Petroleum and petro byproducts run the world. In GOD we trust, Guns Oil and Drugs.