The world is a step closer to a global currency, backed by a global central bank, running monetary policy for all humanity. A single clause in Point 19 of the communiqu issued by the G20 leaders amounts to revolution in the global financial order. We have agreed to support a general SDR allocation which will inject $250bn (170bn) into the world economy and increase global liquidity," it said. SDRs are Special Drawing Rights, a synthetic paper currency issued by the International Monetary Fund that has lain dormant for half a century.In effect, the G20 leaders have activated the IMF's power to create money and begin global "quantitative easing". In doing so, they are putting a de facto world currency into play. It is outside the control of any sovereign body. Conspiracy theorists will love it. There is now a world currency in waiting. In time, SDRs are likely evolve into a parking place for the foreign holdings of central banks, led by the People's Bank of China. Beijing's moves this week to offer $95bn in yuan currency swaps to developing economies show how fast China aims to break dollar dependence.