Country GDP rankings in 2060 (PPP terms)
Based on PwC's forecasts ( https://en.wikipedia.org/wiki/List_of_countries_by_past_and_projected_GDP_(PPP)#Long_term_GDP_estimates ). the chart below shows the proportion of global GDP in Purchasing Power Parity terms in 2060. Purchaseing Parity Power terms is the best measure, because it relates to what a country's GDP can buy - the important measure (eg what you can purchase to fight a war - hence military might for example). For more discusson, you might like to go to this link:- http://www.puzzlefinancialadvice.com/largest-emergence-event
