calledeech, mark carney narchy."e ecosystemld to the same standards as the rest of the financial system. he said digital currencies have failed as a form of money. he expanded on those thoughts as he spoke to bloomberg after the speech. >> there are three ways to measure a currency. is it a store of value, reliable, can hold a stable value? , the volatility of the coin is 10 times more volatile than sterling. important thing is that working as a medium of exchange, how well can you use it to buy goods? it is not that efficient. about two pounds to use big going on a transaction basis . you layer on top of that the envirostarm -- the environmental costs and other factors, it is not as good as doing is what it is supposed to do. it does point them -- point the way to the future of money. the glass half-empty. we are not worried about it displacing conventional currencies, but it does throw a andlenge to central banks those who oversee payment systems and markets of how to reorganize those to better serve customers. you