well, there is an exchanger cartel. The biggest ones agreed to collaborate each other and here we are. It is the same BTC price despite the fact that BTC is NOT a centralized market. IT IS NOT possible a such thing while there is not any central authority. 
example : Coinbase and Bistamp are very tightly coupled. They have the same shareholders
Look to ALL the biggest exchangers and you will see a similar price even it's from Singapore, China, USA or Europe... HOW IS it possible if there is no cartel?
example : Coinbase and Bistamp are very tightly coupled. They have the same shareholders
Look to ALL the biggest exchangers and you will see a similar price even it's from Singapore, China, USA or Europe... HOW IS it possible if there is no cartel?