Ok - it looks like they reached that conclusion by multiplying the number of Bitcoins transacted, by the dollar value of a Bitcoin. Fair enough, but its a meas

Ok - it looks like they reached that conclusion by multiplying the number of Bitcoins transacted, by the dollar value of a Bitcoin. Fair enough, but its a measure vulnerable to the problem that days-destroyed is trying to solve - it'd be easy for people currently sitting on large volumes of Bitcoin to 'solve the problem' that is highlighted by Krugman, by just shuffling their coins around.