Many countries below, or above, the euro area average inflation rates in recent years have remained in this position for at least a decade on average. Such widespread persistence of inflation differentials over long periods does not occur in the United States.
And we are now seeing signs of limited reversals: some euro area countries with relatively high inflation rates have moved down to, or even below, the euro area average. Overall, these corrections are welcome, but  9  Asdrubali, Sorensen and Yosha, (1996) “Channels of Interstate Risk Sharing: United States 1963-1990”, Quarterly Journal of Economics, CXI, November: 1081-1110.