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Presenting differing views on the future of the euro zone, French central bank chief Francois Villeroy de Galhau and Dutch national bank Governor Klaas Knot both warned that the euro zone has grown too reliant on the European Central Bank's unprecedented stimulus and needs to rethink how the bloc functions.
Cutting rates deep into negative territory, buying 1.7 trillion euros worth of assets and offering ultra cheap loans to the bank sector, the ECB has pushed euro zone growth above potential in recent years, giving Europe its best stretch since the start of the financial crisis.
But euro zone countries have still diverged over the past decade, with Italy, Spain, Portugal and Greece falling behind their peers, challenging the notion of convergence and threatening the very viability of the currency bloc as public confidence erodes and social tensions rise.
Villeroy argued that the relative stability of the euro zone nonetheless opens a window to reform and that the currency bloc should now set up an institution to fully coordinate national fiscal and structural policies, transferring some national authority to a powerful euro zone finance minister with a budget.
Such a minister should eventually preside over a euro area budget, backed by a Treasury administration, because the lack of economic coordination weighs on growth and keeps the bloc vulnerable to crises, Villeroy, who is also a member of the ECB's Governing Council argued.
"In the first stage, member states would be free to join... In a second stage, this budget could become a common stabilisation instrument, centralising a well-defined set of policy instruments, such as a European layer for unemployment insurance."
"The third and final stage of fiscal integration would only be achieved if agreement can be found both on financing and on the desirable level of business cycle synchronization," Villeroy said.
Such proposals are relatively common among those in the bloc seeking tighter integration. But there is often little appetite for them among some member states. Expressing scepticism with political will for such a leap, Knot argued for an incremental approach to integration with a focus on minimum criteria for stability and growth.
Knot said Europe needed to strengthen compliance with its budget rules, complete the banking union and implement the bloc's services directive, which alone would add 1.5 percent to growth.