Much of the macro policy framework is designed for demand shocks.
Agnès Bénassy-Quéré, Second Deputy Governor of the Banque de France in this speech discusses how suuply shocks are rising and this requires rethinking on the fiscal-monetary policy framework:
There is no consensus on the impact of climate change and the green transition on activity and inflation, as this largely depends on how the transition is implemented. However, it is likely that supply shocks – whether temporary or persistent – will become more frequent than in the past. In order to address this challenge, a more flexible policy mix may be required.
Fiscal policy could become more targeted and flexible. In the event of a negative supply shock, for example, the government may wish to prioritise support for investment, so as not to delay the transition and thus protect itself against future supply shocks. In the same vein, Fornaro and Wolf (2023) propose temporarily subsidising corporate investment when monetary policy is tightened. This could mitigate the adverse impact of monetary tightening on economic activity while promoting long-term growth. Cox et al (2024), for their part, argue that in the event of a supply shock, fiscal policy should be targeted at the sectoral level and neutral at the aggregate level. What all these proposals have in common is that monetary policy should be left with the task of stabilisation at the aggregate level, giving priority to price stability.
Monetary policy, meanwhile, could adopt a more differentiated approach to supply shocks. For example, the ECB could focus more on core inflation (excluding energy and food) rather than headline inflation during temporary energy shocks. However, as it is generally not known at the outset whether shocks will be temporary or persistent, a hybrid approach will probably be necessary.
Debates on the green transition generally focus on their comparative costs in terms of activity. The above discussion suggests that models should be developed to compare the impact of different strategies in terms of inflation too. A study by the Banque de France (Allen et al., 2023) shows that, depending on the instruments used, the transition could be inflationary or disinflationary.






