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buy STEEM when its low

Low is relative. What is low?

Under $1 is good, but preferably as low as possible. It can go even lower than that. You can follow the price here https://coinmarketcap.com/currencies/steem/

Also, follow the internal market here on Steemit too.

Coin Marketplace

STEEM 0.04
TRX 0.32
JST 0.080
BTC 60288.06
ETH 1572.33
USDT 1.00
SBD 0.47