bancor (en)

a supranational currency imagined by Keynes between 1940–1942 and which the UK proposed to introduce after WWII; it could then be used in international trade as a unit of account within a multilateral clearing system—the International Clearing Union—which would also have to be founded

rentiers (en)

a Marxist term (though never actually used by Karl Marx himself) refering to those who receive income - usually interest, rent, dividends, capital gains, or profits - from their assets and investments

secular stagnation (en)

a condition of negligible or no economic growth in a market-based economy ("secular" as in "long-term", in contrast to "cyclical" or "short-term")

Tobin tax (en)

a proposed tax on international financial transactions, especially speculative currency exchange transactions; suggested by Nobel Memorial Prize in Economic Sciences Laureate economist James Tobin