Let us assume a unit of labour in France can produce either 6 units of coke or 2 units of wine annually, and a unit of labour in Slovakia can produce either 2 units of coke or 6 units of wine annually. Each nation has 10 unit of labours. For many years the two countries traded, each completely specializing in producing the good for which it has a comparative advantage. Now, however, war has broken out between them and all trade has stopped. Without trade, France produces and consumes 30 units of coke and 10 units of wine annually. Slovakia produces and consumes 10 units of coke and 30 units of wine. By how much has the combined yearly output of the two countries declined? O 10 units of coke and 10 units of wine. O 20 units of coke and 20 units of wine. O 30 units of coke and 30 units of wine. O 40 units of coke and 40 units of wine