MPC balances inflation and output under flexible mandate

The Bank of England's Monetary Policy Committee (MPC) operates under a flexible inflation targeting mandate, balancing price stability with output volatility.

This approach is rooted in two key features of its remit.

First, low and stable inflation is considered the best long-term contribution of monetary policy.

Second, the remit allows for temporary deviations from the inflation target to avoid 'undesirable volatility in output' due to short-term trade-offs.

This flexible interpretation is widely supported by parliamentary discussions, academic analyses, and government statements, including HM Treasury's 2013 review, which affirmed the UK's flexible inflation targeting since 1992.

The mandate can be formalized by minimizing a 'loss function' that accounts for deviations of inflation from target and output from its potential.

The remit's instruction to avoid 'undesirable volatility' implies a positive weight on output stability, recognizing that not all output fluctuations are detrimental to welfare.

The MPC's framework operates as 'constrained discretion', allowing flexibility within broad remit parameters.

This discretion is balanced by robust accountability mechanisms.

When inflation deviates by one percentage point or more from target, the Governor must write an open letter to the Chancellor, explaining the reasons, outlook, policy actions, and the horizon for returning inflation to target.

This process subjects the MPC's implied choice of output stability preference to public scrutiny.

The concept of 'trade-off management' inherently arises from the Phillips curve, which connects output and inflation.

This macroeconomic cornerstone underpins modern monetary economics and central bank policymaking, illustrating how policy actively creates the necessary trade-offs to achieve optimal outcomes.