David Cay Johnston: "How Did We Get Here?" - Part 2 of 4 (audio) ROCHESTER, NY (WXXI) - In the four-part economic history series, Pulitzer prize-winning journalist and best-selling author David Cay Johnston traces modern economic principles to their humble beginnings thousands of years ago. In Part Two, Johnston and WXXI's Julie Philipp examine why "progressive taxation" has survived the ages. © Copyright 2009, WXXI