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Its the same way for bitcoin differnt exchanges trade at different prices if you hit the market tab in coinmarketcap it will show you how much that coins trading at each exchange.

Coin Marketplace

STEEM 0.16
TRX 0.17
JST 0.029
BTC 69437.28
ETH 2488.70
USDT 1.00
SBD 2.54