Edited sentence: A country in a monetary union cannot use weakening of currency to recover its international competitiveness.A monetary union means countries lose the main mechanism of recovery of their international competitiveness by weakening (depreciating) their currency.Fall of output and employment in tradable goods sector may be offset by growth of non-exports sectors, especially in construction and services.Increased shopping abroad and negative current account balance can be financed without a problem as long as credit is cheap.The need to finance trade deficit weakens currency making exports automatically more attractive in a country and abroad.This drive fall of employment and output in exports sector and fall of trade and current account balances.This means years of high unemployment and lower incomes as it was during European sovereign-debt crisis.To achieve this a country has to reduce prices, including wages (deflation).When wages become too high compared to productivity in exports sector then these exports become more expensive and they are crowded out from the market within a country and abroad