Forget Brexit. Growth in the eurozone is slowing down, but not equally for all countries. Which leaves the continent with the same question it's had for a decade: is it capable of making policy flexible enough for all of its economies? Waltraud Schelkle of the London School of Economics argues that Europe's currencies always swung with the deutschmark, so the European Central Bank offers some level of control. Ashoka Mody of Princeton says the euro will never be flexible enough to let countries like Italy make adjustments.