The Phillip's curve is represented as
. We have
,
,
and
. The equation would be hence
. Also, note that
.
For t=1, we have
or
or
or
.
For t=2, since
, we have
or
or
or
.
For t=3, since
, we have
or
or
or
.
As can be seen, if unemployment rate is forced to be hold below
the natural rate, then inflation would increase.