@yalu1006 - You might be correct. I had written about this in my blog https://steemit.com/bitcoin/@ajain/dark-side-of-bitcoin and this is one of the factors that make Bitcoin attractive as well as dangerous. I, however, believe, that Bitcoin exchanges don't convert the currencies equivalent as trading is done in currency of your choosing. So essentially, instead of using the currency ratios (determined by banks), bitcoin users create the true value of currency ratios. Isn't that cool!