(Figure: A Country's Before and After Trade Equilibria)
Using the graph, how can you decide whether the nation
has "gained" from trade and has a higher standard of
living?

Question

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The Answer of  
(Figure: A Country's Before and After Trade Equilibria)
Using the graph, how can you decide whether the nation
has "gained" from trade and has a higher standard of
living?

(Figure: a Country's Before and After Trade Equilibria)