This question already has an answer here:
Well, I am starting now with bitcoin in Brazil (realizing my country is a non-concern in terms of the answer), I noted that final value change depends on exchange used.
So, if I buy a bitcoin in MERCADOBITCOIN (Exchange 1) for R$ 2383,00, I can sell this in FOXBIX (Exchange 2) for R$ 2500,00 in same minute. Is this difference in value normal ? Why does bitcoin have different values across different exchanges?