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The system is decentralized which means that there is nobody controlling the price. Supply and demand are the main reasons that price is going up and the only reason for drastic fall would be that everyone that is holding the bitcoin would like to sell it at once.

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STEEM 0.12
TRX 0.34
JST 0.033
BTC 122215.20
ETH 4358.33
BNB 1283.08
SBD 0.78