Each Car produced in Country A costs (or uses up) 2 Food units, even if subsidies are given to car makers. If the subsidized Cars are then sold to Country B for 1/2 a unit of Food, the country loses 1.5 units of Food for each exported Car. Even though auto makers may be compensated the missing 1.5 units, it doesn't change the fact that Country A used up 2 units of Food in the production of each Car.
On the graph to the right, we show various PPFs faced by Country A depending on the number of Cars it exports. On the PPF labeled EX-10, Country A exports 10 Cars. Country A uses up 20 units of Food in their production of the Cars and only gets back 5 units of Food from buyers in Country B, leaving Country A capable of producing only 85 units of Food for domestic consumption (or Car-Food combinations, shown along the PPF labeled EX-10).
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