Insane difference in price on Coinbase and Poloniex!

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POLONIEX: $15.000 right now

COINBASE: $15.950 right now

Isnt that insane?
Anyone know the reasons for this? I understand there would always be some small difference, but almost $1000 is a lot?
Isnt it?

On another note: WOW! BTC passed $15K!!!! :)

Insane difference in price on Coinbase and Poloniex! | Ecency