Is China on the brink of eclipsing the United States as the world's economic megapower, with the yuan taking over from the dollar as the global currency, and China able to exercise financial, military and political hegemony?

Or is China's economic growth about to slow to 3 percent a year as the country is forced to change its growth model?

These two contrary views have been published by reputable economists recently. Arvind Subramanian, senior fellow at the Peterson Institute for International Economics, believes that the rise of China is unstoppable and so is the decline of the United States.