This paper proposes a new route, namely efficient bargains between the
union and the firm over wage and employment, to shed Eight on the con
tractionary effects of a currency devaluation. It is found that a curr
ency devaluation will definitely depress the supply of domestic goods
when the union and the firm negotiate an efficient wage-employment con
tract. Thus our result can be regarded as a theoretical vehicle for ex
plaining the empirical findings of the contractionary devaluation.