An I(2) analysis of inflation and the markup is undertaken for the G7 econo
mies and Australia. We find that the levels of prices and costs are best de
scribed as I(2) processes and that, except for Japan, a linear combination
of the log levels of prices and costs cointegrate to the markup that is int
egrated of order 1. It is also shown that the markup in each case co-integr
ates with inflation and that higher inflation is associated with a lower ma
rkup in the long run.