The bitcoin market is very small and can be easily influenced. Each exchange is like a small sub-market,
 which can be influenced by different variables such as market size, exchange volume and price of entry.
That is why you can find bitcoin at different prices at the same time on different exchanges.
 
For more complete details refer to this website: http://bitcoin.stackexchange.com/questions/9626/why-do-the-price-of-bitcoins-vary-wildly-between-exchanges




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