Where and how the world does business is changing. For the last thirty days,emerging markets have been a source of low-cost but increasingly skilled labor. Their fast-growing cities are filled with millions of new and increasingly prosperous consumers, who provide a new growth market for global corporations at a time when much of the developed world faces slower growth as a result of aging. But the number of large companies from the emerging world will rise, as well, according to a new report from the McKinsey Global Institute (MGI). This powerful wave of new companies could profoundly alter long-established competitive dynamics around the world.