Let me emphasise that the concern about PQE is that it would be used excessively, and in doing so would contribute to inflation. The whole issue is whether we can trust that PQE will not be abused. Murphy attempts to downplay this fear by claiming that he wants “modest” PQE, and that it’s a good idea because inflation is under target. But if Murphy’s reasons for advocating PQE circa 2015 are sincere, this implies that he did not think there was a case for PQE in 2011. My recollection is that he has been advocating PQE throughout this time period, even when inflation was above target.
To explain: the answer is always more Murphmonster, it’s the reasons why that change.