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Attention is most often focused on net exports because that figure measures the net effect of a nation's trade in goods and services with the rest of the world . In 2000, net exports were 5.8% of GNP and in 2005, they were 6.8% . If the information above
In transportation model of O R once an initial solution has been found, the next step is to test that solution for optimality. The methods widely used for testing the solution are: