Gore Vidal, the American writer, once described the American economic system as 'free enterprise for the poor and socialism for the rich'. Macroeconomic policy on the global scale is a bit like that. It is Keynesianism for the rich countries and monetarism for the poor.
Rich countries have 'kicked away the ladder' by forcing free-market, free-trade policies on poor countries. Already established countries do not want more competitors emerging through the nationalistic policies they themselves successfully used in the past.