Bitcoin enjoys bumper futures start

The launch of futures traded on a regulated exchange is a watershed for bitcoin.

Dealers said initial volumes exceeded expectations, while traffic on Cboe's website was so strong that it caused delays and outages.

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Federal Reserve Chair Janet Yellen: US rates are expected to rise this week.

What would come after a Fed rate rise

The Federal Reserve is expected to end the year by raising rates for just the fifth time since the GFC. But pressures are building that could prompt the Fed to start moving a little more quickly.