The attractions of a new common currency are most obvious for Argentina, where annual inflation is approaching 100 per cent as the central bank prints money to fund spending. During President Alberto Fernández’s first three years in office, the amount of money in public circulation has quadrupled, according to central bank data, and the largest denomination peso bill is worth less than $3 on the widely used parallel exchange rate.
However, there will be concern in Brazil about the idea of hitching Latin America’s biggest economy to that of its perennially volatile neighbour. Argentina has been largely cut off from international debt markets since its 2020 default and still owes more than $40bn to the IMF from a 2018 bailout.