An unknown man in a forgotten office develops a number that makes and breaks Presidents. A poet turns his song towards a metal object. Two 19th century men tire themselves out making machines They can't know their work will one day put us on the Moon.   And a man tries to invent an un-commerce, but may have built the 21st century economy instead. In the fifth episode of our series on American commerce, we look at the appraisal and measuring and counting of business.