By Marc Jones LONDON (Reuters) – Evidence emerging from the first central bank digital currencies (CBDCs) around the world suggests there is no one-size-fits-all model as stability and privacy are designed into systems, the head of the International Monetary Fund has said. Roughly 100 countries are now looking at CBDCs, the IMF estimates, and it published a study on Wednesday looking at six nations including China, Sweden and the Bahamas where digital money is already up and running or at an advanced stage. In a speech on the report, IMF Managing Director Kristalina Georgieva said there were a…