As South Korea shows, active participation in international trade does not require free trade. Indeed, had South Korea pursued free trade and not promoted infant industries, it would not have become a major trading nation. It would still be exporting raw materials (e.g., tungsten ore, fish, seaweed) or low-technology, low-price products (e.g., textiles, garments, wigs made with human hair) that used to be its main export items in the 1960s.
The widely accepted assertion that, only if you let markets be will everyone be paid correctly and thus fairly, according to his worth, is a myth. Only when we part with this myth and grasp the political nature of the market and the collective nature of individual productivity will we be able to build a more just society in which historical legacies and collective actions, and not just individual talents and efforts, are properly taken into account in deciding how to reward people.
The free market doesn't exist. Every market has some rules and boundaries that restrict freedom of choice. A market looks free only because we so unconditionally accept its underlying restrictions that we fail to see them.
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.