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In Poloniex one can only trade two Steem pairs (STEEM/BTC, and STEEM/ETH). So I chose STEEM/BTC. It is all about supply/demand.

Coin Marketplace

STEEM 0.17
TRX 0.15
JST 0.028
BTC 59893.00
ETH 2414.92
USDT 1.00
SBD 2.43