A few thoughts, focusing on narrow issues of macroeconomic management rather than the bigger political issues.
The United Kingdom has been running a sizeable current account deficit for some time now, thanks to an unusually low national savings rate. That means, on net, it has been supplying the rest of Europe with demand—something other European countries need. This isn’t likely to provide Britain the negotiating leverage the Brexiters claimed (the other European countries fear the precedent more than the loss of demand) but it will shape the economic fallout.
The fall in the pound is a necessary part of the United Kingdom’s adjustment. It will spread the pain from a downturn in British demand to the eurozone. Brexit uncertainty is thus a sizable negative shock to growth in Britian’s eurozone trading partners not just to Britain itself: relative to the pre-Brexit referendum baseline, I would guess that Brexit uncertainty will knock a cumulative half a percentage point off eurozone growth over the next two years.*
Of course, the eurozone, which runs a significant current account surplus and can borrow at low nominal rates, has the fiscal capacity to counteract this shock. Germany is being paid to borrow for ten years, and the average ten-year rate for the eurozone as a whole is around 1 percent. The eurozone could provide a fiscal offset, whether jointly, through new eurozone investment funds or simply through a shift in say German policy on public investment and other adjustments to national policy.
I say this knowing full-well the political constraints to fiscal action. The Germans do not want to run a deficit. The Dutch are committed to bringing an already low deficit down further. France, Italy, and especially Spain face pressure from the commission to tighten policy. The Juncker plan never really created the capacity for shared funding of investment. The eurozone’s aggregate fiscal stance is, more or less, the sum of national fiscal policies of the biggest eurozone economies.
If I had to bet, I would bet that the eurozone’s aggregate fiscal impulse will be negative in 2017—exactly the opposite of what it should be when a surplus region is faced with a shock to external demand. A lot depends on the fiscal path Spain negotiates once it forms a new government, given that is running the largest fiscal deficit of the eurozone’s big five economies.
Economically, the eurozone would also benefit from additional focus on the enduring overhang of private debt, and the nonperforming loans (NPLs) that continue to clog the arteries of credit. Debt overhangs in the private sector—Dutch mortgage debt, Portuguese corporate debt, Italian small-business loans—are one reason why eurozone demand growth has lagged.
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