BTC - EUR : correction strikes, major differences between exchanges

We have experienced a small correction in bitcoin prices. What is interesting is that it affected exchanges differently.

On Kraken the pice of BTC fell to 2400€
On coinbase it fell only to 2450€

I never realized there could be such difference in case of sudden movement.

What do you think about it? Do you think it would be worthwhile to register on several exchanges?