When it is in contact with the foreign sector. Household/business sectors will make the item order is best, but in the leak. If the business sector/household goods and services are exported, including inputs to foreign countries is considered as the best spraying. That flow of circulation economy When you turn on the country will be increased or decreased based on the net value of exports and imports.
If net exports (exports-imports) is positive. The economy will expand. In contrast, if the negative net exports. The economy is shrinking.