They mean a supranational currency aimed at transforming international trade settlement that sounds very similar to the idea of Bancor that Keynes proposed. The key idea is to establish a common unit of account and clearing system for international transactions. This would prevent the dominance of national currencies in international trade, promoting a more equitable financial system that's not dominated by the currency of any single country.

This concept would tackle persistent trade imbalances by incentivizing countries to maintain balanced trade, as excessive surpluses or deficits would incur penalties. The idea also has potential to enhance financial stability by countering speculative capital flows that often destabilized exchange rates and caused financial crises.