This week Ray Dalio, the founder of the world’s largest hedge fund, Bridgewater Associates, which has some $155bn in funds under management, said that current unconventional efforts to raise economic growth through bond buying in the markets, which is called quantitative easing or more commonly money printing, have lost their potency and central banks may have to resort to radical measures such as “helicopter money.” On Thursday the Organisation for Economic Cooperation and Development (OECD) — a think tank for 34 mainly developed country governments — said governments must act “urgently” and “collectively” to raise spending in advanced economies as it cut its growth forecasts against a backdrop falling trade and market turmoil. The OECD reduced growth estimates for every member of the G7 group of leading industrial nations — the US, Japan, Germany, France, UK, and Canada.