By Derek Thompson Jun 19 2012, 8:59 AM ET 180 That headline is a big promise. But here it is: The economic history of the world going back to Year 1 showing the major powers' share of world GDP, from a research letter written by Michael Cembalest, chairman of market and investment strategy at JP Morgan. I'm guessing that your first question, if you started scanning from the left, is: Wait, India was by far the biggest economy at the dawn of AD? Yup, India. In Year 1, India and China were home to one-third and one-quarter of the world's population, respectively. It's hardly surprising, then, that they also commanded one-third and one-quarter of the world's economy, respectively. Before the Industrial Revolution, there wasn't really any such thing as lasting income growth from productivity. In the thousands of years before the Industrial Revolution, civilization was stuck in the Malthusian Trap. If lots of people d...